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The different ‘places’ where one discusses or presents work, and the particular quality of the environment where these take place. These spatial metaphors range in character from being in-progress, pedagogical or informal to communicative, informational or archival.
The variety of media and formats in which research outputs can take shape, engaging different forms of communication, reaching particular audiences and accomplishing specific purposes.
The different ways in which one person ‘knows more than she can tell’ depending on the character and origin of the knowledge. These different forms of tacit knowing describe its specificity: pointing out whether something is implicit because it is unconscious, unrecognized, unsaid, uncodified etc.
The keywords, fields and concepts that situate the particular contributions of the network within broader literature and schools of thought.
The different phases and forms of dissemination that research and academic outputs can take, indicating the kind of publication, the progress of the work or the forum where they are presented.
The idioms that reflect the multinational character and vocalize the conversations of the TACK network and its outputs.
The members, contributors, facilitators, communities and organizations that build up, around and underneath the TACK Network and participate, in one way or another, in the endeavour of addressing the question of Tacit Knowledge in architecture.

50 Objects

Book chapter TACK Book

Traveling Perspectives: Tracing ‘impressions’ of a project in Flanders

Fig. 6.2: Focus on the front façade of the BMCC. Photographed December 2022.
ABSTRACT
The collection of localities that play an active (and overlooked) or quiescent (yet potent) role in architectural practices are put in question here. The chapter investigates how a project and its site specific geographical setting can contain traces of broader architectural contexts. It asks how architectural collaborative approaches that stem from the encounter of different perspectives can be read in the lived environment through the lens of plurilocality. Distinct yet intermingling perspectives of a contemporary architectural realisation are drawn out through a dive into the meeting and convention centre in Bruges. This is a building designed by two offices based in different architectural environments — the Portuguese practice Souto de Moura Arquitectos alongside the Antwerp-based firm META architectuurbureau. Various perspectives of the same building are set in parallel, exploring place through similarities and differences. From different modes of apprehending the project, concepts of place and architectural intentions set in motion in this instance are unpacked, involving a transversal reading through a broader architectural community of practice. Active instances of getting to know a place through experience can thereby be tacit yet situated: they can be embodied, embedded and enacted. This further explores Maurice Merleau-Ponty’s hint of a depth found in the latent form of impressions, in their ‘caché-révélé’ or hidden-revealed. Expressions of such instances, through interpreting reflexive features of buildings that stem from plurilocal collaborations, become productive insights into the mechanisms of place relation, their transfers and interweaving, and their impact in architectural design practices. Most of all, these parcels of the tacit dimension of place interpretation are put forward as such: aggregates that interfere with- and feed a relation-full practice of living environments.
Caendia Wijnbelt
Book chapter TACK Book

November 1, 2022

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Traveling Perspectives: Tracing ‘impressions’ of a project in Flanders

Caendia Wijnbelt
Fig. 6.2: Focus on the front façade of the BMCC. Photographed December 2022.
Fig. 6.X: Analogue double exposures. The BMCC overlayed with the Beursplein neighbourhood, photographed December 2022.
Fig. 6.X: Double exposure;;;;
Fig. 6.5: View of the historical center of Bruges from the Belvedere of the BMCC, photographed February 2022.
Fig. 6.X: Analogue double exposures
Figure 6.X: BMCC, photographed February 2022
Fig. 6.9:
ABSTRACT
The collection of localities that play an active (and overlooked) or quiescent (yet potent) role in architectural practices are put in question here. The chapter investigates how a project and its site specific geographical setting can contain traces of broader architectural contexts. It asks how architectural collaborative approaches that stem from the encounter of different perspectives can be read in the lived environment through the lens of plurilocality. Distinct yet intermingling perspectives of a contemporary architectural realisation are drawn out through a dive into the meeting and convention centre in Bruges. This is a building designed by two offices based in different architectural environments — the Portuguese practice Souto de Moura Arquitectos alongside the Antwerp-based firm META architectuurbureau. Various perspectives of the same building are set in parallel, exploring place through similarities and differences. From different modes of apprehending the project, concepts of place and architectural intentions set in motion in this instance are unpacked, involving a transversal reading through a broader architectural community of practice. Active instances of getting to know a place through experience can thereby be tacit yet situated: they can be embodied, embedded and enacted. This further explores Maurice Merleau-Ponty’s hint of a depth found in the latent form of impressions, in their ‘caché-révélé’ or hidden-revealed. Expressions of such instances, through interpreting reflexive features of buildings that stem from plurilocal collaborations, become productive insights into the mechanisms of place relation, their transfers and interweaving, and their impact in architectural design practices. Most of all, these parcels of the tacit dimension of place interpretation are put forward as such: aggregates that interfere with- and feed a relation-full practice of living environments.
Online Teaching Module

On Method: Tacit Knowledge in the Expanded Field of Architecture

© Anna Livia Vørsel
Anna Livia Vørsel Helena Mattsson Helena Mattsson Jennifer Mack KTH Royal Institute of Technology, KTH School of Architecture
Online Teaching Module

February 10, 2022

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On Method: Tacit Knowledge in the Expanded Field of Architecture

Anna Livia Vørsel Helena Mattsson Helena Mattsson Jennifer Mack KTH Royal Institute of Technology, KTH School of Architecture
© Anna Livia Vørsel
© Anna Livia Vørsel
© Anna Livia Vørsel
© Anna Livia Vørsel
© Anna Livia Vørsel
© Anna Livia Vørsel
Book chapter TACK Book

Exploring Spatial Perception through Performative 1:1 Extended Reality Models: Preliminary insights from Infra-thin Magick

© TACK
ABSTRACT
Building on scenography, performance theory and findings from neurosciences, tacit knowing in architecture is understood here as embodied, embedded and enacted perceptual dimension of our built environment. Through art- and design-based research, tacitly knowing is examined as a form of practice and a new extended reality (XR) design tool is probed to exercise it. Since the atmospheric turn in architecture (Böhme 2017, McCormack 2014, Bille et al. 2015), it is well known that spatial perception is multi-sensory and that the interplay of our senses goes beyond the cross-fertilization of sight, touch, taste, smell and hearing. Nevertheless, architectural designers may have only touched the surface of what we might be able to feel regarding our spatial environments. Apart from the sensation of our movement and whether our environment is too hot or cold, our abilities to feel space physically remain challenging to represent and communicate through conventional architectural tools. This includes i.e. our sense of balance, our ability to feel time passing, our knowledge of which of our body parts are where without having to look at them, and our sense of gravity, orientation, and illumination. Some of these “always-there-but-never-felt” sensations can be revealed and physically experienced when entering a fully immersive virtual environment for the first time. As our brain takes a split second to adjust to the novel surroundings, it is at this moment that we can suddenly sense our senses at work. The XR case study “Infra-thin Magick”, exhibited as part of Speculative Fiction at the Academy of Fine Arts Vienna in 2022, explains how such unanticipated insights can be purposefully evoked by displacing and reassembling the components constituting our multimodal and synaesthetic spatial perception. Leaning on the design theoretician Thea Brejzek and Lawrence Wallan’s understanding of the “autonomous model”, this performative real-time and -scale XR model that oscillates between physical installation and virtual reality (VR) experience is employed as an operative tool for designing and analyzing spatial experiences beyond the known sensations of our built environment. First user-testing results are presented, and the premise of the autonomous model to co-create reality and allow architects to research through active participation, first-hand experience, discovery, and play are brought to light.
Paula Strunden
Book chapter TACK Book

November 1, 2022

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Exploring Spatial Perception through Performative 1:1 Extended Reality Models: Preliminary insights from Infra-thin Magick

Paula Strunden
© TACK
ABSTRACT
Building on scenography, performance theory and findings from neurosciences, tacit knowing in architecture is understood here as embodied, embedded and enacted perceptual dimension of our built environment. Through art- and design-based research, tacitly knowing is examined as a form of practice and a new extended reality (XR) design tool is probed to exercise it. Since the atmospheric turn in architecture (Böhme 2017, McCormack 2014, Bille et al. 2015), it is well known that spatial perception is multi-sensory and that the interplay of our senses goes beyond the cross-fertilization of sight, touch, taste, smell and hearing. Nevertheless, architectural designers may have only touched the surface of what we might be able to feel regarding our spatial environments. Apart from the sensation of our movement and whether our environment is too hot or cold, our abilities to feel space physically remain challenging to represent and communicate through conventional architectural tools. This includes i.e. our sense of balance, our ability to feel time passing, our knowledge of which of our body parts are where without having to look at them, and our sense of gravity, orientation, and illumination. Some of these “always-there-but-never-felt” sensations can be revealed and physically experienced when entering a fully immersive virtual environment for the first time. As our brain takes a split second to adjust to the novel surroundings, it is at this moment that we can suddenly sense our senses at work. The XR case study “Infra-thin Magick”, exhibited as part of Speculative Fiction at the Academy of Fine Arts Vienna in 2022, explains how such unanticipated insights can be purposefully evoked by displacing and reassembling the components constituting our multimodal and synaesthetic spatial perception. Leaning on the design theoretician Thea Brejzek and Lawrence Wallan’s understanding of the “autonomous model”, this performative real-time and -scale XR model that oscillates between physical installation and virtual reality (VR) experience is employed as an operative tool for designing and analyzing spatial experiences beyond the known sensations of our built environment. First user-testing results are presented, and the premise of the autonomous model to co-create reality and allow architects to research through active participation, first-hand experience, discovery, and play are brought to light.
Drawing Exhibition TACK Exhibition Object

Ulrich Mahler’s Exkursionszettel Wagbachniederung

Ulrich Mahler’s Exkursionszettel exemplifies the importance of embodied tacit knowledge in the management of constructed landscapes.
Johanna Just
Drawing Exhibition TACK Exhibition Object

May 29, 2022

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Ulrich Mahler’s Exkursionszettel Wagbachniederung

Johanna Just
© TACK
Ulrich Mahler’s Exkursionszettel exemplifies the importance of embodied tacit knowledge in the management of constructed landscapes.
Review

Report from the TACK Talks #1

© TACK
What sort of tacit knowledge can we glean on Zoom, when so much architectural literature on the tacit insists on prolonged physical interaction? The answer is a great deal, going by the first series of TACK Talks. Across 9 online lectures, 9 practices, 14 designers, 10 ESR respondents, 3 moderators and a weekly audience of between 85 and an astonishing 535 viewers, the TACK network joined together to tackle a deceptively simple question: ‘how do we know?’. Their responses reveal the breadth of experience and depth of reflective thinking in the network, already establishing key themes in how we conceive tacit knowledge.
Hamish Lonergan
Review

August 18, 2020

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Report from the TACK Talks #1

Hamish Lonergan
© TACK
© TACK
© TACK
© TACK
What sort of tacit knowledge can we glean on Zoom, when so much architectural literature on the tacit insists on prolonged physical interaction? The answer is a great deal, going by the first series of TACK Talks. Across 9 online lectures, 9 practices, 14 designers, 10 ESR respondents, 3 moderators and a weekly audience of between 85 and an astonishing 535 viewers, the TACK network joined together to tackle a deceptively simple question: ‘how do we know?’. Their responses reveal the breadth of experience and depth of reflective thinking in the network, already establishing key themes in how we conceive tacit knowledge.
Diagram Drawing Presentation Video

Re-enacting Le Corbusier’s way of sketching

Paula Strunden and Desilava Petkova (as students) are re-enacting the Le Corbusier's style to sketch.
Paula Strunden Desislava Petkova Angelika Schnell Eva Sommeregger Academy of Fine Arts Vienna, Institute for Art and Architecture
Diagram Drawing Presentation Video

November 13, 2012

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Re-enacting Le Corbusier’s way of sketching

Paula Strunden Desislava Petkova Angelika Schnell Eva Sommeregger Academy of Fine Arts Vienna, Institute for Art and Architecture
Paula Strunden and Desilava Petkova (as students) are re-enacting the Le Corbusier's style to sketch.
Essay Paper

The Royal National Theatre from Architectural Review to TikTok

@whoresonlybathroom, ‘Brutalist architecture needs to die’, TikTok screenshot, 17 December 2019, © Hamish Lonergan
ABSTRACT
The Royal National Theatre in London (1976), designed by Denys Lasdun, has attracted an unusually high volume of critical debate. Tracing the ways that critics have disagreed over time, particularly on aesthetic grounds, reveals the fluctuating fortunes of concrete Brutalist architecture beyond the theatre. This cycle has continued to inform discussion online, on social media platforms including TikTok. Ultimately, this essay argues that the only way to make sense of these conflicting accounts is to value the theatre for its capacity to generate critical, aesthetic judgments.
Hamish Lonergan
Essay Paper

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The Royal National Theatre from Architectural Review to TikTok

Hamish Lonergan
@whoresonlybathroom, ‘Brutalist architecture needs to die’, TikTok screenshot, 17 December 2019, © Hamish Lonergan
© Patrick Mackie
ABSTRACT
The Royal National Theatre in London (1976), designed by Denys Lasdun, has attracted an unusually high volume of critical debate. Tracing the ways that critics have disagreed over time, particularly on aesthetic grounds, reveals the fluctuating fortunes of concrete Brutalist architecture beyond the theatre. This cycle has continued to inform discussion online, on social media platforms including TikTok. Ultimately, this essay argues that the only way to make sense of these conflicting accounts is to value the theatre for its capacity to generate critical, aesthetic judgments.
Book chapter TACK Book

Decoding a Practice’s DNA: Multiple registers of tacit knowledge

ABSTRACT
In the manifold spectrum of how tacit knowledge can be conceived in architecture, the contribution aims to investigate that embedded in the architects' design process by reflecting on the codes they employ.   If the vectors are tools or communicative materials –i.e., drawings, sketches, models, texts, etc.– used for transmission, the codes are here interpreted as those characters –whether in the form of recurring patterns or aesthetic choices, technical solutions, vocabulary, etc.– that define the specificity of a practice. As the DNA of an office, and not just of its principal, as Rem Koolhaas argues (Winston, 2016), they articulate across different levels depending on the context within which they are shared: spanning from the ones used within the practice itself –forming the basis for collaboration between different project team members;– to those adopted externally to communicate with both clients and an extended community of practice. Differences in terms of codes might parallel diverse methods for their investigation. Indeed, for the former, the use of an ethnographic approach capable of unpacking specificities from within seems to be the most adequate –i.e., revealing how the implicit values of a practice are transferred into form through a collective process mediated by multiple actors;– for the latter, instead, it would be more proper to employ public occasions as a pretext through which to decipher a shared “language.” (Eco, 1976).   In general, the paper argues that codification processes are necessarily conditioned by the context in which they take place, by the positioning within the disciplinary debate, and by the actors (Latour and Yaneva. 2008) participating in their development. These closely interrelated aspects constitute the tacit knowledge inherent to a practice. Hence, although capable of changing over time, such knowledge is a unique and characterized product for an office. At the same time, it is the contribution that each firm provides in shaping its community of practice, whose shared knowledge unfolds through exchanges and encounters.
Claudia Mainardi
Book chapter TACK Book

November 1, 2022

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Decoding a Practice’s DNA: Multiple registers of tacit knowledge

Claudia Mainardi
ABSTRACT
In the manifold spectrum of how tacit knowledge can be conceived in architecture, the contribution aims to investigate that embedded in the architects' design process by reflecting on the codes they employ.   If the vectors are tools or communicative materials –i.e., drawings, sketches, models, texts, etc.– used for transmission, the codes are here interpreted as those characters –whether in the form of recurring patterns or aesthetic choices, technical solutions, vocabulary, etc.– that define the specificity of a practice. As the DNA of an office, and not just of its principal, as Rem Koolhaas argues (Winston, 2016), they articulate across different levels depending on the context within which they are shared: spanning from the ones used within the practice itself –forming the basis for collaboration between different project team members;– to those adopted externally to communicate with both clients and an extended community of practice. Differences in terms of codes might parallel diverse methods for their investigation. Indeed, for the former, the use of an ethnographic approach capable of unpacking specificities from within seems to be the most adequate –i.e., revealing how the implicit values of a practice are transferred into form through a collective process mediated by multiple actors;– for the latter, instead, it would be more proper to employ public occasions as a pretext through which to decipher a shared “language.” (Eco, 1976).   In general, the paper argues that codification processes are necessarily conditioned by the context in which they take place, by the positioning within the disciplinary debate, and by the actors (Latour and Yaneva. 2008) participating in their development. These closely interrelated aspects constitute the tacit knowledge inherent to a practice. Hence, although capable of changing over time, such knowledge is a unique and characterized product for an office. At the same time, it is the contribution that each firm provides in shaping its community of practice, whose shared knowledge unfolds through exchanges and encounters.
Exhibition TACK Exhibition Object

RE-enactment

In 2015 we exhibited our work in this gallery and made some spatial interventions, including coloured columns, such as this one. These interventions represented our way of thinking, reflecting, acting, and communicating. We believe that a RE-enactment of a part of this exhibition fits well within the TACK framework. We thus proposed to RE-instal a column.
Architecten Jan De Vylder Inge Vinck
Exhibition TACK Exhibition Object

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RE-enactment

Architecten Jan De Vylder Inge Vinck
© TACK
In 2015 we exhibited our work in this gallery and made some spatial interventions, including coloured columns, such as this one. These interventions represented our way of thinking, reflecting, acting, and communicating. We believe that a RE-enactment of a part of this exhibition fits well within the TACK framework. We thus proposed to RE-instal a column.
Lecture / Talk Video

Tack Talks #1: Cityförster

Verena Brehm CITYFÖRSTER Lara Schrijver Caendia Wijnbelt
Lecture / Talk Video

July 16, 2020

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Tack Talks #1: Cityförster

Verena Brehm CITYFÖRSTER Lara Schrijver Caendia Wijnbelt
© TACK
Frame from the online talk with Verena Brehm, Lara Schrijver, Caendia Wijnbelt, © TACK
A slide from Verena Brehm’s presentation, © Verena Brehm, Cityförster
Circular City principle: a frame from the presentation by Cityförster, © Cityförster
A slide from Verena Brehm’s presentation, © Cityförster
Drawing Exhibition TACK Exhibition Object

City as Forest

© Verena Brehm
We understand the city as a forest: a complex (eco)system in which various spatial elements are synergistically and dynamically networked. In this sense, with every design, the challenge and the opportunity arise to contribute to the system as a whole rather than creating a solitary object.
Verena Brehm CITYFÖRSTER
Drawing Exhibition TACK Exhibition Object

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City as Forest

Verena Brehm CITYFÖRSTER
© Verena Brehm
© TACK
We understand the city as a forest: a complex (eco)system in which various spatial elements are synergistically and dynamically networked. In this sense, with every design, the challenge and the opportunity arise to contribute to the system as a whole rather than creating a solitary object.
Essay Open Access Publication

2021

Investigating the 21st Century Emerging Approaches to Practice: Codification of Architectural Epistemes, from Discourses to Practices

© Claudia Mainardi
ABSTRACT
Given the timeframe of the last 20 years, the research investigates the codification of diverse forms of tacit knowledge in architecture, its transfer, and translation from institutional narratives to principles and conventions that are crystallized in the everyday practice of selected design offices. Positioned into the lines of theories that see architecture as “a product” of a socio-political-economic condition, the aim is to understand how events that have occurred/are occurring in current times influence the professional practice and, consequently, its codes. The work is imagined to be developed through three phases. A first part –conceived as macro- analysis– is proposed as an attempt to reconstruct a historical framework of events not yet historicized; a second and intermediate one identifies the protagonists –or the practices that the research is interested at–; and a third one –as micro- analysis– made of in-depth investigations of case studies selected through the protagonists of the second phase.
Claudia Mainardi
Essay Open Access Publication

2021

View

Investigating the 21st Century Emerging Approaches to Practice: Codification of Architectural Epistemes, from Discourses to Practices

Claudia Mainardi
© Claudia Mainardi
ABSTRACT
Given the timeframe of the last 20 years, the research investigates the codification of diverse forms of tacit knowledge in architecture, its transfer, and translation from institutional narratives to principles and conventions that are crystallized in the everyday practice of selected design offices. Positioned into the lines of theories that see architecture as “a product” of a socio-political-economic condition, the aim is to understand how events that have occurred/are occurring in current times influence the professional practice and, consequently, its codes. The work is imagined to be developed through three phases. A first part –conceived as macro- analysis– is proposed as an attempt to reconstruct a historical framework of events not yet historicized; a second and intermediate one identifies the protagonists –or the practices that the research is interested at–; and a third one –as micro- analysis– made of in-depth investigations of case studies selected through the protagonists of the second phase.
Book chapter Essay

Introduction to “Entwerfen Erforschen: Der performative turn in der Architekturlehre” (2016)

© Angelika Schnell
This is the introduction to the book "Angelika Schnell, Eva Sommeregger, Waltraud Indrist (Hrsg.), Entwerfen Erforschen: Der performative turn in der Architekturlehre, Birkhäuser Publishers, Basel/Berlin/Boston 2016".
Angelika Schnell
Book chapter Essay

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Introduction to “Entwerfen Erforschen: Der performative turn in der Architekturlehre” (2016)

Angelika Schnell
© Angelika Schnell
This is the introduction to the book "Angelika Schnell, Eva Sommeregger, Waltraud Indrist (Hrsg.), Entwerfen Erforschen: Der performative turn in der Architekturlehre, Birkhäuser Publishers, Basel/Berlin/Boston 2016".
Book chapter TACK Book

Mouldy Smells and Tacit Noses: knowledges coming into view

© TACK
ABSTRACT
In 2016 two ‘moisture experts’ visited a small public building in Stockholm. Moisture had started to seep in, and mould started to grow in the wooden park building, the spores making the staff working there ill. The experts recorded the levels of microorganisms in the interior air and the composite building materials with scientific equipment and expert noses, identifying certain elements through technological data and odorous qualities. The expert noses registered the same smells as the staff in the buildings, but evaluated, analysed and categorised them according to their expert knowledge field.   Rather than aiming to make tacit knowledges explicit, this paper puts forward a methodological approach to tacit knowledge which unpacks and makes visible what tacit knowledges does, how it operates, and what and who it affects within architecture. By engaging with material ‘events’ (Bennett, 2010) and ‘stutters’ (Graham and Thrift, 2007), like this mould and its smell, through archival documents, scientific reports and changing building materials, the testimony of the material (Material Witness, Schuppli, 2020) makes visible the socio-economic and political value systems and decision-making processes embedded into the fabric of the building. It unpacks how things, otherwise hidden, come into view when systems, infrastructures and buildings break and fall apart, and how the various knowledge productions and value systems tied and embedded into this specific building and its mouldy materials can be unfolded and detangled through a theoretical framework of stutters, ruptures and events. Through this building, its smelly materials, and the different noses inside it, expert and non-expert, the paper unpacks how tacit knowledges operates, who or what can carry it, and what and who it affects.
Anna Livia Vørsel
Book chapter TACK Book

November 1, 2022

View

Mouldy Smells and Tacit Noses: knowledges coming into view

Anna Livia Vørsel
© TACK
ABSTRACT
In 2016 two ‘moisture experts’ visited a small public building in Stockholm. Moisture had started to seep in, and mould started to grow in the wooden park building, the spores making the staff working there ill. The experts recorded the levels of microorganisms in the interior air and the composite building materials with scientific equipment and expert noses, identifying certain elements through technological data and odorous qualities. The expert noses registered the same smells as the staff in the buildings, but evaluated, analysed and categorised them according to their expert knowledge field.   Rather than aiming to make tacit knowledges explicit, this paper puts forward a methodological approach to tacit knowledge which unpacks and makes visible what tacit knowledges does, how it operates, and what and who it affects within architecture. By engaging with material ‘events’ (Bennett, 2010) and ‘stutters’ (Graham and Thrift, 2007), like this mould and its smell, through archival documents, scientific reports and changing building materials, the testimony of the material (Material Witness, Schuppli, 2020) makes visible the socio-economic and political value systems and decision-making processes embedded into the fabric of the building. It unpacks how things, otherwise hidden, come into view when systems, infrastructures and buildings break and fall apart, and how the various knowledge productions and value systems tied and embedded into this specific building and its mouldy materials can be unfolded and detangled through a theoretical framework of stutters, ruptures and events. Through this building, its smelly materials, and the different noses inside it, expert and non-expert, the paper unpacks how tacit knowledges operates, who or what can carry it, and what and who it affects.
Exhibition Model TACK Exhibition Object

Maputo Land Rover

Between 1998 and 2005, we engaged in the design and construction of the Dutch Embassy in Mozambique. Offering an opportunity to tap into local tacit knowledge, this project revealed the importance of culturally specific knowledge and skills in design and building projects.
Kees Kaan
Exhibition Model TACK Exhibition Object

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Maputo Land Rover

Kees Kaan
© TACK
Between 1998 and 2005, we engaged in the design and construction of the Dutch Embassy in Mozambique. Offering an opportunity to tap into local tacit knowledge, this project revealed the importance of culturally specific knowledge and skills in design and building projects.
Online Teaching Module

Probing Tacit Knowledge. Codes of Tacit Knowledge

© Claudia Mainardi
Claudia Mainardi Gennaro Postiglione Gaia Caramellino Politecnico di Milano, Department of Architecture and Urban Studies
Online Teaching Module

March 10, 2023

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Probing Tacit Knowledge. Codes of Tacit Knowledge

Claudia Mainardi Gennaro Postiglione Gaia Caramellino Politecnico di Milano, Department of Architecture and Urban Studies
© Claudia Mainardi
© Claudia Mainardi
© Claudia Mainardi
© Claudia Mainardi
© Claudia Mainardi
© Claudia Mainardi
Conference Paper Open Access Publication

Everyday Practice As Paradigm To Study Architectural Contemporary Codes

© Claudia Mainardi
Claudia Mainardi's contribution presented at the CA2RE Delft conference has been a significant opportunity to discuss her doctoral research that, dealing with the present history, proposes an empirical approach: without aiming to achieve a definitive response, yet disentangling processes while being formed.
Claudia Mainardi
Conference Paper Open Access Publication

March 2, 2023

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Everyday Practice As Paradigm To Study Architectural Contemporary Codes

Claudia Mainardi
© Claudia Mainardi
© Claudia Mainardi
Claudia Mainardi's contribution presented at the CA2RE Delft conference has been a significant opportunity to discuss her doctoral research that, dealing with the present history, proposes an empirical approach: without aiming to achieve a definitive response, yet disentangling processes while being formed.
Review

Book Corner: “Architecture: The History of Practice.” by Cana Cuff (1992)

© Dana Cuff
The book offers an in-depth analysis of the architectural practice culture –focusing specifically on the American one– as a “social construction”. It puts attention on the tacit knowledge seen as able to disentangle the substance of a professional ethos –affecting both espoused theory and theory-in-use, and it concludes that the design process is based on collective actions as the result of negotiations within a social process.
Claudia Mainardi
Review

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Book Corner: “Architecture: The History of Practice.” by Cana Cuff (1992)

Claudia Mainardi
© Dana Cuff
The book offers an in-depth analysis of the architectural practice culture –focusing specifically on the American one– as a “social construction”. It puts attention on the tacit knowledge seen as able to disentangle the substance of a professional ethos –affecting both espoused theory and theory-in-use, and it concludes that the design process is based on collective actions as the result of negotiations within a social process.
TACK Book

Tacit Knowledge in Architecture, A Quest

This is the introduction to the TACK Book "Perspectives on Tacit knowledge in Architecture" written by Tom Avermaete, Margitta Buchert, Janina Gosseye and Klaske Havik.
Tom Avermaete Margitta Buchert Janina Gosseye Klaske Havik
TACK Book

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Tacit Knowledge in Architecture, A Quest

Tom Avermaete Margitta Buchert Janina Gosseye Klaske Havik
This is the introduction to the TACK Book "Perspectives on Tacit knowledge in Architecture" written by Tom Avermaete, Margitta Buchert, Janina Gosseye and Klaske Havik.
Lecture / Talk Video

TACK Talks #2: How to archive embodied knowledge?

Sofie de Caigny Vlaams Architectuurinstituut (VAi) Monika Platzer Architekturzentrum Wien (AzW) Ionas Sklavounos Paula Strunden Mara Trübenbach Eric Crevels
Lecture / Talk Video

March 11, 2021

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TACK Talks #2: How to archive embodied knowledge?

Sofie de Caigny Vlaams Architectuurinstituut (VAi) Monika Platzer Architekturzentrum Wien (AzW) Ionas Sklavounos Paula Strunden Mara Trübenbach Eric Crevels
© TACK
© TACK
© TACK
© TACK
© TACK
© TACK
© TACK
Conference Paper Paper Session ACTORS TACK Conference Proceedings

In Quest of Meaning – Revisiting the discourse around “non-pedigreed” architecture.

ABSTRACT
In their practice, architects never refer to something as “pedigreed” to describe their work. However, during the 1960s, Bernard Rudofsky introduced the term "non-pedigreed" architecture, which he attributed to edifices not designed by formally trained architects, but for various reasons, their status exceeds that of the "mere building". As a fact, since explicit knowledge around “non-pedigreed” architecture is scarce, architects rely mostly on interpretations. This contribution revisits several of these interpretations through the perspective of its "actors," referring to the scholarly work of selected architects, and it is structured into three parts. The first section introduces the motivations behind the study of "non-pedigreed" architecture, delving into questions of aesthetics and authorship. The second part explores the fruitful contradictions arising from the first section and focuses on the relationship between vernacular architecture and the concept of Time, as well as the development of craft skills. Finally, the third part examines specific case studies where the value of vernacular architecture shifts from being merely a reference point to becoming an integral part of the architectural production process.
Vasileios Chanis
Conference Paper Paper Session ACTORS TACK Conference Proceedings

June 21, 2023

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In Quest of Meaning – Revisiting the discourse around “non-pedigreed” architecture.

Vasileios Chanis
Figure 1 and Figure 2: Jacques Tati, Mon Oncle, 1958 (Directed and produced by Jacques Tati)
ABSTRACT
In their practice, architects never refer to something as “pedigreed” to describe their work. However, during the 1960s, Bernard Rudofsky introduced the term "non-pedigreed" architecture, which he attributed to edifices not designed by formally trained architects, but for various reasons, their status exceeds that of the "mere building". As a fact, since explicit knowledge around “non-pedigreed” architecture is scarce, architects rely mostly on interpretations. This contribution revisits several of these interpretations through the perspective of its "actors," referring to the scholarly work of selected architects, and it is structured into three parts. The first section introduces the motivations behind the study of "non-pedigreed" architecture, delving into questions of aesthetics and authorship. The second part explores the fruitful contradictions arising from the first section and focuses on the relationship between vernacular architecture and the concept of Time, as well as the development of craft skills. Finally, the third part examines specific case studies where the value of vernacular architecture shifts from being merely a reference point to becoming an integral part of the architectural production process.
Paper Site writing

REFLECTIVE ANIMATION. Navigating the What-What

© Jhono Bennett
ABSTRACT
Critically engaging with one’s positionality in contemporary architectural research in a post-Apartheid South African context requires an approach that blends concerns about identity, location, and voice in responsibly creative means, while not reinforcing the existing power dynamics inherent in such work. This essay employs Jane Rendell’s Site-Writing modality to develop a means of navigating these inter-demographic and inter-locational dilemmas - the What-What - that emerge when working from a »northerly« located institution and speaking from a »Southern« position through multiple audiences. A reflective-animation method has been developed that provides a proto-methodology for both documenting and speculating with the tacit nature of spatial design practice in post-Apartheid South African cities.
Jhono Bennett
Paper Site writing

November 1, 2022

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REFLECTIVE ANIMATION. Navigating the What-What

Jhono Bennett
© Jhono Bennett
Figure 10: A Screen Grab from the Digital Exhibition of the Site-Writing Project Entitled: Spirit of the Order (Bennett 2021) that Blends Animation with Writing and Drawing., © Jhono Bennett
© Jhono Bennett
ABSTRACT
Critically engaging with one’s positionality in contemporary architectural research in a post-Apartheid South African context requires an approach that blends concerns about identity, location, and voice in responsibly creative means, while not reinforcing the existing power dynamics inherent in such work. This essay employs Jane Rendell’s Site-Writing modality to develop a means of navigating these inter-demographic and inter-locational dilemmas - the What-What - that emerge when working from a »northerly« located institution and speaking from a »Southern« position through multiple audiences. A reflective-animation method has been developed that provides a proto-methodology for both documenting and speculating with the tacit nature of spatial design practice in post-Apartheid South African cities.
Paper Paper Session ACTORS TACK Conference Proceedings

Understanding the roles of tacit knowledge in the historical collaboration between AEC: a case study approach

Author: Laurens Bulckaen (picture taken) Title: Testing report of Hennebique office on the reinforced concrete floors of the Postal office in Ghent (1906) source: KADOC
ABSTRACT
This paper tries to introduce three kinds of tacit knowledge that, according to the authors, are present in the process of designing and constructing a building. By looking through the lens of the concept of tacit knowledge, collaboration between the architect, engineer and contractor, thus the building professionals is evaluated. By closely examining a limited number of key archival documents in three case studies that were already developed before, it becomes visible that tacit knowledge is an indispensable part of the intangible process of collaboration in building. Since creating buildings requires to assemble large amounts of knowledge from a wide variety of disciplines, also interdisciplinary knowledge is necessary, which is often tacit in nature. As the complexity in building grew, throughout history it also became visible that roles of the building actors started to shift and new roles emerged. Using the concept of tacit knowledge this research tries to bridge the gap of looking at the building process as a collaborative effort also showing that the building process is governed by much more than the factual explicit knowledge of only one actor.
Laurens Bulckaen Rika Devos
Paper Paper Session ACTORS TACK Conference Proceedings

June 20, 2023

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Understanding the roles of tacit knowledge in the historical collaboration between AEC: a case study approach

Laurens Bulckaen Rika Devos
Author: Laurens Bulckaen (picture taken) Title: Testing report of Hennebique office on the reinforced concrete floors of the Postal office in Ghent (1906) source: KADOC
Author: Laurens Bulckaen (picture taken) Title: Detail of testing report of Hennebique office on the reinforced concrete floors of the Postal office in Ghent (1906) source: KADOC
ABSTRACT
This paper tries to introduce three kinds of tacit knowledge that, according to the authors, are present in the process of designing and constructing a building. By looking through the lens of the concept of tacit knowledge, collaboration between the architect, engineer and contractor, thus the building professionals is evaluated. By closely examining a limited number of key archival documents in three case studies that were already developed before, it becomes visible that tacit knowledge is an indispensable part of the intangible process of collaboration in building. Since creating buildings requires to assemble large amounts of knowledge from a wide variety of disciplines, also interdisciplinary knowledge is necessary, which is often tacit in nature. As the complexity in building grew, throughout history it also became visible that roles of the building actors started to shift and new roles emerged. Using the concept of tacit knowledge this research tries to bridge the gap of looking at the building process as a collaborative effort also showing that the building process is governed by much more than the factual explicit knowledge of only one actor.
Site writing Website

2019-2023

Writing Urban Places – New Narratives of the European City

© Klaske Havik
Writing Urban Places proposes an innovative investigation and implementation of a process for developing human understanding of communities, their society, and their situatedness, by narrative methods.
Klaske Havik
Site writing Website

2019-2023

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Writing Urban Places – New Narratives of the European City

Klaske Havik
© Klaske Havik
Writing Urban Places proposes an innovative investigation and implementation of a process for developing human understanding of communities, their society, and their situatedness, by narrative methods.
Image Newsletter Reflection

A Map of Movements

Gennaro Postiglione initiated the idea of a “TACK Map”, visualizing the research movements of the TACK PhD Students and shares with here his thoughts on the produced map.
Gennaro Postiglione
Image Newsletter Reflection

May 20, 2022

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A Map of Movements

Gennaro Postiglione
Gennaro Postiglione initiated the idea of a “TACK Map”, visualizing the research movements of the TACK PhD Students and shares with here his thoughts on the produced map.
Essay Journal Article Open Access Publication

Labor, Prescription and Alienation in Architecture: Critical Notes On The Architect’s Practice

Image 01: Tower of Babel under Construction Date: 1590 Artist: unknown Source: https://www.wga.hu/html/m/master/zunk_ge/zunk_ge4/ztower_b.html, © Public Domain
ABSTRACT
The present essay seeks to point out contemporary phenomena of decreasing autonomy by the alienation of everyday skills that, together with architectural drawing, promote the architect and urbanist’s figure to that of an expert, thus immobilizing its practice in a heteronomous form. It aims the exposition, with the critiques of Ivan Illich and Sérgio Ferro, how the architect’s practice contributes to the alienation and exploitation of the construction worker’s labour in detriment of the body-skill dialectics, which would allow for a closer relation between individual and society. Opposing this alienation processes, both in consuming as in the production of architecture, with studies about technology and anthropology, it argues in favor of a politics of transformation of architectures technology based on the relation between body, skills, learning and technique.
Eric Crevels
Essay Journal Article Open Access Publication

October 16, 2022

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Labor, Prescription and Alienation in Architecture: Critical Notes On The Architect’s Practice

Eric Crevels
Image 01: Tower of Babel under Construction Date: 1590 Artist: unknown Source: https://www.wga.hu/html/m/master/zunk_ge/zunk_ge4/ztower_b.html, © Public Domain
Image 02: Building of Babel Date: 1882 Artist: Edmund Ollier Source: https://archive.org/details/dli.granth.77290/mode/2up , © Public Domain
Image 03: Weltchronik in Versen, Szene: Der Turmbau zu Babel Date: circa 1370 Artist: Meister der Weltenchronik Source: The Yorck Project (2002) 10.000 Meisterwerke der Malerei (DVD-ROM), distributed by DIRECTMEDIA Publishing GmbH. ISBN: 3936122202., © Public Domain
ABSTRACT
The present essay seeks to point out contemporary phenomena of decreasing autonomy by the alienation of everyday skills that, together with architectural drawing, promote the architect and urbanist’s figure to that of an expert, thus immobilizing its practice in a heteronomous form. It aims the exposition, with the critiques of Ivan Illich and Sérgio Ferro, how the architect’s practice contributes to the alienation and exploitation of the construction worker’s labour in detriment of the body-skill dialectics, which would allow for a closer relation between individual and society. Opposing this alienation processes, both in consuming as in the production of architecture, with studies about technology and anthropology, it argues in favor of a politics of transformation of architectures technology based on the relation between body, skills, learning and technique.
Newsletter Review

Book Corner: “The Invention of Culture” by Wagner Roy (1976)

The Invention of Culture, Wagner, Roy. (1976), © University of Chicago Press
Eric Crevels reviews the chapter "The assumption of Culture" from Roy Wagners Book "The Invention of Culture" (1976), The University of Chicago Press, London, Page 12 - 21
Eric Crevels
Newsletter Review

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Book Corner: “The Invention of Culture” by Wagner Roy (1976)

Eric Crevels
The Invention of Culture, Wagner, Roy. (1976), © University of Chicago Press
Eric Crevels reviews the chapter "The assumption of Culture" from Roy Wagners Book "The Invention of Culture" (1976), The University of Chicago Press, London, Page 12 - 21
Exhibition Model TACK Exhibition Object

Clay Landscape

This 1:1000 landscape model made from clay shows the site of a prominent 12th century church and graveyard located between two housing areas, Tensta and Rinkeby, built during the 1960´s as part of the Million Programme in Stockholm, where we are currently adding a wall of housing combined with an assembly hall, 100 metres long. In our practice we have used this kind of clay model for numerous projects over the years.
Ola Broms Wessel Klas Ruin Spridd
Exhibition Model TACK Exhibition Object

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Clay Landscape

Ola Broms Wessel Klas Ruin Spridd
© TACK
This 1:1000 landscape model made from clay shows the site of a prominent 12th century church and graveyard located between two housing areas, Tensta and Rinkeby, built during the 1960´s as part of the Million Programme in Stockholm, where we are currently adding a wall of housing combined with an assembly hall, 100 metres long. In our practice we have used this kind of clay model for numerous projects over the years.
Book chapter TACK Book

Coarse epistemes: Skill, craftsmanship and tacit knowledge in the grit of the world

© TACK
ABSTRACT
In the words of Dutch archaeologist Maikel Kuijpers, craft is “a way of exploring and understanding the material world”. This definition suggests that craftsmanship can be understood as a touchstone for a theory of knowledge in material productions. By exploring the role of skill in the processes of making and its epistemic correspondence, I develop the hypothesis that craftsmanship is as a perceptive-cognitive enactment within the making process, a form of attunement with production. The argument is that the material, productive side of work deploys and operates a particular epistemological regime, based on types of practical engagement deeply related to the possibilities and contingencies of objective, concrete reality. Making means implicating oneself with the material world, embedding the body in the processes of transforming matter and partaking in the flows of forces that form things. Thus, the knowledge in the making – skill – can be understood as the invention or establishment of a new mode of perception through action that is enacted by tools, movements, techniques etc. This practical perception acts as the foundational basis on which craftsmanship is performed, representing its conditions of possibility. Given the perceptual, embodied nature of craftsmanship, its transmission is rendered impossible outside the actual engagement with production. As such, this interpretation refers back to the original distinctions made by Gilbert Ryle of “knowing that” and “knowing how” that influenced Michael Polanyi in his definition of tacit knowledge. The particular epistemic rationality of crafts provides insights for understanding knowledge inside disciplines involved with creative practice, such as architecture. The epistemic coupling with production helps to understand how architects design, but it also reveals a general epistemic schism in the discipline, founded in the inconsistency between abstract designerly knowledge and the craftsmanship of construction.
Eric Crevels
Book chapter TACK Book

November 1, 2022

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Coarse epistemes: Skill, craftsmanship and tacit knowledge in the grit of the world

Eric Crevels
© TACK
ABSTRACT
In the words of Dutch archaeologist Maikel Kuijpers, craft is “a way of exploring and understanding the material world”. This definition suggests that craftsmanship can be understood as a touchstone for a theory of knowledge in material productions. By exploring the role of skill in the processes of making and its epistemic correspondence, I develop the hypothesis that craftsmanship is as a perceptive-cognitive enactment within the making process, a form of attunement with production. The argument is that the material, productive side of work deploys and operates a particular epistemological regime, based on types of practical engagement deeply related to the possibilities and contingencies of objective, concrete reality. Making means implicating oneself with the material world, embedding the body in the processes of transforming matter and partaking in the flows of forces that form things. Thus, the knowledge in the making – skill – can be understood as the invention or establishment of a new mode of perception through action that is enacted by tools, movements, techniques etc. This practical perception acts as the foundational basis on which craftsmanship is performed, representing its conditions of possibility. Given the perceptual, embodied nature of craftsmanship, its transmission is rendered impossible outside the actual engagement with production. As such, this interpretation refers back to the original distinctions made by Gilbert Ryle of “knowing that” and “knowing how” that influenced Michael Polanyi in his definition of tacit knowledge. The particular epistemic rationality of crafts provides insights for understanding knowledge inside disciplines involved with creative practice, such as architecture. The epistemic coupling with production helps to understand how architects design, but it also reveals a general epistemic schism in the discipline, founded in the inconsistency between abstract designerly knowledge and the craftsmanship of construction.
Lecture / Talk Object Session LINEAGES

Re-enacting Tacit Knowledge in Colonial Mapping Practices

This text is an extended retrospective summary of Eva Sommeregger's talk entitled "Navigating, Performing and Book Making", given at the Tacit Knowledge Symposium at ETH Zurich during the Object Session Lineages on 20 June 2023.
Eva Sommeregger
Lecture / Talk Object Session LINEAGES

June 20, 2023

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Re-enacting Tacit Knowledge in Colonial Mapping Practices

Eva Sommeregger
Tupaia’s map, drawn by the author on Forster’s copy; the connecting lines between the islands and numbering logic were added by the author; the islands marked with an x were added by the Europeans to start the mapping process but Tupaia did not include them in his scheme. 1 Rurutu, 2 Ra‘ivavae; 3 Rarotonga, 4 Niue, 5a Vava‘u, 5b Uiha; 6 Manuae, 7a Maupiha‘a, 7b Motu One, 7c Miti‘aro, 8a Mangaia, 8b ?, 8c Atiu, 9 Rimatara, 10 Rurutu, 11 Tupua‘I, 12 Ra‘ivavae, 13 Rapa Iti; 14 Uea, 15 Rotuma, 16a Savai‘I, 16b Uvea, 17a Upolu, 17b Niuafo‘ou, 18 Niatoputapu and Tafai, 19 Tutuila, 20 Manua, 21 Motu a Manu; 22 Ra‘ivavae, 23 Mangareva, 24 Temoe, 25 Oeno, 26 Pitcairn Island, 27 Henderson, 28 Ducie, 29 Rapa Nui; 30 Nuku Hiva, 31a Hiva‘Oa, 31b Ua Pou; 32 Marquesas Group, 33 Oahu. Photograph of the map displayed in the limited edition leporello version of TUPAIA, KYBERNETES & LARA CROFT. Bodily Perspectives on Postdigital Spaces
© TACK
This text is an extended retrospective summary of Eva Sommeregger's talk entitled "Navigating, Performing and Book Making", given at the Tacit Knowledge Symposium at ETH Zurich during the Object Session Lineages on 20 June 2023.
Journal Article

Architectural Ethnography? Incipits, distances, horizons for research and teaching practices

Figura 1 – profili degli abitanti e nuove tipologie di stanze (ReCoDe 2019), © Gennaro Postiglione
ABSTRACT
Architectural ethnography has increasingly been a focus of attention thanks to recent studies carried out by Albena Yaneva or to practices and research carried out by Momoyo Kaijima with her Atelier Bow Wow. Starting from an interest in the specificities of ethnographical approaches if practiced by architects, or by professionals and researchers having particular attention to forms, materiality and uses of the space in the everyday, this article outlines a literature review on ethnography for designers. This review has been helpful in defining through convergences and distances a specific positioning that we are assuming in teaching and doing research for design. A path that led to further questions on the role of transcription (graphical, photographic, textual) in architectural ethnography, as well as to challenging the role of tradition and innovation in this recent stream of research. 
Gennaro Postiglione Paola Briata
Journal Article

June 18, 2022

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Architectural Ethnography? Incipits, distances, horizons for research and teaching practices

Gennaro Postiglione Paola Briata
Figura 1 – profili degli abitanti e nuove tipologie di stanze (ReCoDe 2019), © Gennaro Postiglione
Figura 3 – La mostra finale di Gratosoglio Ground Zero (2019) , © Gennaro Postiglione
Figura 4 – La vita attorno agli oggetti (QLHL 2020), © Gennaro Postiglione
ABSTRACT
Architectural ethnography has increasingly been a focus of attention thanks to recent studies carried out by Albena Yaneva or to practices and research carried out by Momoyo Kaijima with her Atelier Bow Wow. Starting from an interest in the specificities of ethnographical approaches if practiced by architects, or by professionals and researchers having particular attention to forms, materiality and uses of the space in the everyday, this article outlines a literature review on ethnography for designers. This review has been helpful in defining through convergences and distances a specific positioning that we are assuming in teaching and doing research for design. A path that led to further questions on the role of transcription (graphical, photographic, textual) in architectural ethnography, as well as to challenging the role of tradition and innovation in this recent stream of research. 
Conference Paper Journal Article Paper

Aspectos da conceituação do trabalho em Marx: a alienação como abstração concreta

ABSTRACT
This article covers a question relative to the double determination and dialecticity in the concept of labour, as developed by Marx from the Hegelian dialectics. It seeks to demonstrate the ontological significance of the concept to the Marxian thought, a key element in his critics as a path to self-conscience and as a territory for alienation. Through the inquiry on the concepts of abstraction concreteness in relation to labour, it hopes to clarify its employment and epistemological reach as it provides an understanding of alienation as a process of abstraction that, projected in the social relations of production, becomes concrete.
Eric Crevels
Conference Paper Journal Article Paper

July 27, 2020

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Aspectos da conceituação do trabalho em Marx: a alienação como abstração concreta

Eric Crevels
ABSTRACT
This article covers a question relative to the double determination and dialecticity in the concept of labour, as developed by Marx from the Hegelian dialectics. It seeks to demonstrate the ontological significance of the concept to the Marxian thought, a key element in his critics as a path to self-conscience and as a territory for alienation. Through the inquiry on the concepts of abstraction concreteness in relation to labour, it hopes to clarify its employment and epistemological reach as it provides an understanding of alienation as a process of abstraction that, projected in the social relations of production, becomes concrete.
Book Book chapter

The Tacit Dimension [Excerpt]

The book “The Tacit Dimension” by Michael Polanyi was published firstly in 1966 at The University of Chicago Press. The following is an excerpt from the chapter “Tacit Knowing” (p. 4-13). I shall reconsider human knowledge by starting from the fact that we can know more than we can tell. This fact seems obvious enough; but it is not easy to say exactly what it means. Take an example. We know a person’s face, and can recognize it among a thousand, indeed among a million. Yet we usually cannot tell how we recognize a face we know. So most of this knowledge cannot be put into words. But the police have recently introduced a method by which we can communicate much of this knowledge. They have made a large collection of pictures showing a variety of noses, mouths, and other features. From these the witness selects the particulars of the face he knows, and the pieces can then be put together to form a reasonably good likeness of the face. This may suggest that we can communicate, after all, our knowledge of a physiognomy, provided we are given adequate means for expressing ourselves. But the application of the police method does not change the fact that previous to it we did know more than we could tell at the time. Moreover, we can use the police method only by knowing how to match the features we remember with those in the collection, and we cannot tell how we do this. This very act of communication displays a knowledge that we cannot tell.
Michael Polanyi
Book Book chapter

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The Tacit Dimension [Excerpt]

Michael Polanyi
The book “The Tacit Dimension” by Michael Polanyi was published firstly in 1966 at The University of Chicago Press. The following is an excerpt from the chapter “Tacit Knowing” (p. 4-13). I shall reconsider human knowledge by starting from the fact that we can know more than we can tell. This fact seems obvious enough; but it is not easy to say exactly what it means. Take an example. We know a person’s face, and can recognize it among a thousand, indeed among a million. Yet we usually cannot tell how we recognize a face we know. So most of this knowledge cannot be put into words. But the police have recently introduced a method by which we can communicate much of this knowledge. They have made a large collection of pictures showing a variety of noses, mouths, and other features. From these the witness selects the particulars of the face he knows, and the pieces can then be put together to form a reasonably good likeness of the face. This may suggest that we can communicate, after all, our knowledge of a physiognomy, provided we are given adequate means for expressing ourselves. But the application of the police method does not change the fact that previous to it we did know more than we could tell at the time. Moreover, we can use the police method only by knowing how to match the features we remember with those in the collection, and we cannot tell how we do this. This very act of communication displays a knowledge that we cannot tell.