Structuralism as a movement in architecture and urban planning evolved around the middle of the 20th century. It was a reaction to CIAM-Functionalism (Rationalism)  which had led to a lifeless expression of urban planning that ignored the identity of the inhabitants and urban forms.
Structuralism in a general sense is a mode of thought of the 20th century, which came about in different places, at different times and in different fields. It can also be found in linguistics, anthropology, philosophy and art. At the beginning of the general article Structuralism the following explanations are noted:
"Structuralism is a theoretical paradigm emphasizing that elements of culture must be understood in terms of their relationship to a larger, overarching system or structure."
Alternately, as summarized by philosopher Simon Blackburn, "Structuralism is the belief that phenomena of human life are not intelligible except through their interrelations. These relations constitute a structure, and behind local variations in the surface phenomena there are constant laws of abstract culture."
- 1 Structuralism as parallel movement to Postmodernism
- 2 Various movements and directions
- 3 Origins
- 4 Manifesto
- 5 Otterlo Congress – participants
- 6 Definition of the structuralist form
- 7 Theoretical origins, principles and aspects
- 8 Housing estates, buildings and projects
- 9 Different types of structures
- 10 Urban structuring – The art of town planning – (Overarching structures)
- 11 Interrelationships between social and built structures (Team 10)
- 12 Literature and annotations
- 13 Additional publications
Structuralism as parallel movement to Postmodernism
In Europe, structuralism is seen as a parallel movement to American postmodern architecture. The first interpretations of both movements came up in the 1960s. Through publications and presentations by authors such as Charles Jencks, Robert Venturi and Denise Scott Brown, postmodern architecture was successful throughout the world for decades. While postmodernism is concerned with an architectural style, many different aspects of architecture and urbanism are treated in the structuralist movement.
In contrast to the postmodern movement, structuralism has developed more slowly, less noticeably during several different periods in the last decades. The most important theoretical contributions of structuralism were developed in Europe and Japan. In 2011, the first comprehensive compilation of structuralist activity appeared in a publication called, "Structuralism Reloaded". In this extensive book, articles by 47 international authors were published about philosophical, historical, artistic and other relevant aspects. The selecting process for all these different views, including what is more or less important, needs time to give a definitive overall picture of structuralism. The following parts of this article are based on the current state of the publication, "Structuralism Reloaded".
A few months after publishing this book, the RIBA Institute in London discussed the new candidates for the RIBA Gold Medal in 2012. An actual question was: "Should the Venturis be given this year's RIBA Gold Medal?" Surprisingly enough, the RIBA-committee did not award the Venturis with their postmodernist view, and instead, gave Herman Hertzberger the prize for his structuralist architecture and theoretical contributions. The times had changed and a shift in emphasis had occurred. The comment of the former RIBA president Jack Pringle was: "The Royal Gold Medal, Britain's most prestigious award, should go to an architect that has taken us forward, not backwards." Today, postmodern architecture can be compared, to some degree with the architectural movement, Traditionalismus, in Europe.
Various movements and directions
The anthropologist, Claude Lévi-Strauss, remarked: "I do not believe that we can still speak of one structuralism. There were a whole lot of movements that claimed to be structuralist." This diversity can also be found in architecture. However, architectural structuralism has an autonomy that does not comply with all the principles of structuralism in human sciences. In architecture, the different directions have created different images. In this article two directions are discussed. These occur sometimes in combination.
On the one hand, there is the Aesthetics of Number  which was formulated by Aldo van Eyck in 1959. This concept can be compared to cellular tissue. The most influential prototype of this direction is the orphanage in Amsterdam by Aldo van Eyck, completed in 1960. The Aesthetics of Number can also be described as Spatial Configurations in Architecture or Mat-Building (Alison Smithson).
On the other hand, there is the Architecture of Lively Variety (Structure and Coincidence) which was formulated for user participation in housing by John Habraken in 1961. Also, in the 1960s, many well-known utopian projects  were based on the principle of Structure and Coincidence. The most influential prototype of this direction is the Yamanashi Culture Chamber in Kofu by Kenzo Tange, completed in 1967. Similar notions of Architecture of Lively Variety are: Architecture of Diversity, Pluralistic Architecture or Two-Components-Approach.
Structuralism in architecture and urban planning had its origins in the Congrès International d'Architecture Moderne (CIAM) after World War II. Between 1928 and 1959, the CIAM was an important platform for the discussion of architecture and urbanism. Various groups with often conflicting views were active in this organization; for example, members with a scientific approach to architecture without aesthetic premises (Rationalists), members who regarded architecture as an art form (Le Corbusier), members who were proponents of high- or low-rise building (Ernst May), members supporting a course of reform after World War II (Team 10), members of the old guard and so on. Individual members of the small splinter group Team 10 laid the foundations for Structuralism. The influence of this team was later interpreted by second generation protagonist Herman Hertzberger when he said: "I am a product of Team 10." As a group of avant-garde architects, Team 10 was active from 1953 to 1981, and two different movements emerged from it: the New Brutalism of the English members (Alison and Peter Smithson) and the Structuralism of the Dutch members (Aldo van Eyck and Jacob Bakema). 
Outside Team 10, other ideas developed that furthered the Structuralist movement - influenced by the concepts of Louis Kahn in the United States, Kenzo Tange in Japan and John Habraken in the Netherlands (with his theory of user participation in housing). Herman Hertzberger and Lucien Kroll made important architectural contributions in the field of participation.
In 1960, the Japanese architect Kenzo Tange designed his well-known Tokyo Bay Plan. Reflecting later on the initial phase of that project, he said: "It was, I believe, around 1959 or at the beginning of the sixties that I began to think about what I was later to call Structuralism." Tange also wrote the article "Function, Structure and Symbol, 1966", in which he describes the transition from a functional to a structural approach in thinking. Tange considers the period from 1920 to 1960 under the heading of "Functionalism" and the time from 1960 onwards under the heading of "Structuralism".
Le Corbusier created several early projects and built prototypes in a Structuralist mode, some of them dating back to the 1920s. Although he was criticized by the members of Team 10 in the 1950s for certain aspects of his work (urban concept without a "sense of place" and the dark interior streets of the Unité), they nevertheless acknowledged him as a great model and creative personality in architecture and art.
One of the most influential manifestos for the Structuralist movement was compiled by Aldo van Eyck in the architectural magazine Forum 7/1959. It was drawn up as the programme for the International Congress of Architects in Otterlo in 1959. The central aspect of this issue of Forum was a frontal attack on the Dutch representatives of CIAM-Rationalism who were responsible for the reconstruction work after World War II, (for tactical reasons, planners like van Tijen, van Eesteren, Merkelbach and others were not mentioned). The magazine contains many examples of and statements in favour of a more human form of urban planning. This congress in 1959 marks the official start of Structuralism,although earlier projects and buildings did exist. Only since 1969 has the term "Structuralism" been used in publications in relation to architecture.
Otterlo Congress – participants
Some of the presentations and discussions that took place during the Otterlo Congress in 1959 are seen as the beginning of Structuralism in architecture and urbanism. These presentations had an international influence. In the book CIAM '59 in Otterlo the names of the 43 participating architects are listed. While the term structuralism in architecture was published for the first time in 1969.
L. Miquel, Alger / Aldo van Eyck, Amsterdam / José A. Coderch, Barcelona / Wendell Lovett, Bellevue-Washington / Werner Rausch, Berlin / W. van der Meeren, Bruxelles / Ch. Polonyi, Budapest / M. Siegler, Genf / P. Waltenspuhl, Genf / Hubert Hoffmann, Graz / Chr. Fahrenholz, Hamburg / Alison Smithson, London / Peter Smithson, London / Giancarlo de Carlo, Milan / Ignazio Gardella, Milan / Vico Magistretti, Milan / Ernesto Nathan Rogers, Milan / Blanche Lemco van Ginkel, Montreal / Sandy van Ginkel, Montreal / Callebout, Nieuport / Geir Grung, Oslo / A. Korsmo, Oslo / Georges Candilis, Paris / Alexis Josic, Paris / André Wogenscky, Paris / Shadrach Woods, Paris / Louis Kahn, Philadelphia / Viana de Lima, Porto / F. Tavora, Porto / Jacob B. Bakema, Rotterdam / Herman Haan, Rotterdam / J.M. Stokla, Rotterdam / John Voelcker, Staplehurst / Ralph Erskine, Stockholm / Kenzo Tange, Tokyo / T. Moe, Trondheim / Oskar Hansen, Warszawa / Zofia Hansen, Warszawa / Jerzy Soltan, Warszawa / Fred Freyler, Wien / Eduard F. Sekler, Wien / Radovan Niksic, Zagreb / Alfred Roth, Zurich
Definition of the structuralist form
Since structuralism has different directions, there is more than one definition. The theoretical contribution by Herman Hertzberger belongs to the most interesting versions. A recent and often cited statement by Hertzberger is: "In Structuralism, one differentiates between a structure with a long life cycle and infills with shorter life cycles." 
A more detailed description by Hertzberger is published in 1973. It is a structuralist definition in a general sense, but also the basis concept for user participation: "The fact that we put 'form' in a central position with respect to such notions as 'space' or 'architecture', means in itself no more than a shifting of accent. What we are talking about is in fact another notion of form than that, which premises a formal and unchanging relationship between object and viewer, and maintains this. It is not an outward form wrapped around the object that matters to us, but form in the sense of inbuilt capacity and potential vehicle of significance. Form can be filled-in with significance, but can also be deprived of it again, depending on the use that's made of it, through the values we attach to, or add to it, or which we even deprive it of, - all this dependent on the way in which the users and the form react to, and play on each other. The case we want to put is, that it is this capacity to absorb, carry and convey significance that defines what form can bring about in the users - and conversely - what the users can bring about in the form. What matters is the interaction of form and users, what they convey to each other and bring about in each other, and how they mutually take possession of each other. What we have to aim for, is, to form the material (of the things we make) in such a way that - as well as answering to the function in the narrower sense - it will be suitable for more purposes. And thus, it will be able to play as many roles as possible in the service of the various, individual users, - so that everyone will then be able to react to it for himself, interpreting it in his own way, annexing it to his familiar environment, to which it will then make a contribution." p. 56
Compared to other directions of structuralism in architecture, the following clarifications are noted: "In the new architectural movement there is often a tendency to call everything Structuralist that resembles a woven texture and has a grid. This would be a superficial way of looking at things. By nature Structuralism is concerned with the configuration of conditioned and polyvalent units of form (spatial, communicational, constructional or other units) at all urban scales. Only when the users have taken possession of the structures through contact, interpretation or filling-in the details, do the structures achieve their full status. Any architecture that has a tendency to formalism is thus excluded. Flexible form, which has been much discussed, is also rejected as a neutral enclosing system, since it does not offer the appropriate solution for any spatial programme. In the architecture of Herman Hertzberger Structuralist form can be found from the smallest detail up to the most complicated structure, whether it is in terms of spatial, facade or environmental design." p. 56
The next quotation is a definition of structuralism in different fields. It also discusses the autonomy of the primary structure: "Many Structuralists would describe a structure roughly in the following terms: it is a complete set of relationships, in which the elements can change, but in such a way that these remain dependent on the whole and retain their meaning. The whole is independent of its relationship to the elements. The relationships between the elements are more important than the elements themselves. The elements are interchangeable, but not the relationships." p. 16
Theoretical origins, principles and aspects
- Built structures corresponding in form to social structures, according to Team 10 (Working group for the investigation of interrelationships between social and built structures).
- The archetypical behaviour of man as the origin of architecture (cf. Anthropology, Claude Lévi-Strauss). Different Rationalist architects had contacts with groups of the Russian Avant-Garde after World War I. They believed in the idea that man and society could be manipulated.
- Coherence, growth and change on all levels of the urban structure. The concept of a Sense of place. Tokens of identification (identifying devices). Urban Structuring and Articulation (of the built volume).
- Polyvalent form and individual interpretations (compare the concept of langue et parole by Ferdinand de Saussure). User participation in housing. Integration of "high" and "low" culture in architecture (fine architecture and everyday forms of building). Pluralistic architecture.
The principle Structure and Coincidence remains relevant until now, both for housing schemes and urban planning. For housing schemes the following images were influential: the perspective drawing of the project "Fort l'Empereur" in Algiers by Le Corbusier (1934) and the isometric drawing of the housing scheme "Diagoon" in Delft by Herman Hertzberger (1971). At city level, important projects were: the Tokyo Bay Plan of Kenzo Tange (1960) and the fascinating images of the model of the Free University of Berlin by Candilis Josic & Woods (1963). Also worth mentioning are the utopias of Metabolism, Archigram and Yona Friedman. In general, instruments for urban structuring are: traffic lines (e.g. gridiron plans), symmetries, squares, remarkable buildings, rivers, seashore, green areas, hills etc. This methods were also used in previous cities.
The principle Aesthetics of Number proved to be less useful for structuring an entire city. However, exemplary articulated configurations did arise, both in architecture and housing schemes. The first influential images for this direction Aldo van Eyck provided with aerial photos of his orphanage in Amsterdam (1960). Later he built another inspiring configuration for the Space Centre Estec in Noordwijk (1989). These two compositions can be counted among the most beautiful "icons" of structuralism.
Housing estates, buildings and projects
- Atelier 5: Halen housing estate near Bern, 1961
- Van den Broek & Bakema et al.: New Rotterdam districts: Pendrecht project 1949 / Alexanderpolder projects 1953 and 1956
- Piet Blom: Kasbah housing estate in Hengelo, 1973 / Urban district Oude Haven in Rotterdam, 1985
- Candilis Josic & Woods: Free University of Berlin, 1963–73
- Craig Zeidler & Strong: McMaster University Medical Centre in Hamilton Canada, 1972
- Giancarlo De Carlo: Student housing Collegio del Colle Urbino, 1966
- Adriaan Geuze et al.: New urban district Borneo-Sporenburg Scheepstimmermanstraat in Amsterdam, 1997 (participation)
- Herman Hertzberger: Centraal Beheer office building in Apeldoorn, 1972 (participation, inside) / Diagoon, eight experimental houses in Delft, 1971 (participation)
- Louis Kahn: Jewish Community Center in Trenton, project 1954 / Salk Institute in La Jolla California, 1965 / Kimbell Art Museum in Fort Worth, 1972
- Lucien Kroll: Students' Centre St. Lambrechts-Woluwe in Louvain-la-Neuve near Brussels, 1976 (participation)
- Kisho Kurokawa: Nakagin Capsule Tower in Tokyo, 1972
- Le Corbusier: Perspective drawing of new city district Fort l'Empereur in Algiers, project 1934 (participation) / Weekend house near Paris, 1935 / Centre Le Corbusier in Zurich, 1967
- Renzo Piano & Richard Rogers: Centre Georges-Pompidou in Paris, 1977
- Renzo Piano: Zentrum Paul Klee, Museum in Bern, 2005
- Richard Rogers: Madrid-Barajas Airport terminal 4, 2006
- Moshe Safdie: Habitat '67 housing estate, World Exposition in Montréal, 1967 / The Children's Monument Yad Vashem in Jerusalem, 2005
- Alison and Peter Smithson: Golden Lane housing estate in London, project 1952 / Urban-planning scheme 1953: Hierarchy of Association "house-street-district-city"
- Kenzo Tange: Tokyo Bay Plan, project 1960 / Yamanashi Culture Chamber in Kofu, 1967
- Aldo van Eyck: Orphanage in Amsterdam, 1960 / European Space Research and Technology Centre Estec, restaurant conference-hall library in Noordwijk, 1989
- Verhoeven Klunder Witstok & Brinkman: Housing estate in Berkel-Rodenrijs near Rotterdam, 1973
- Stefan Wewerka: New city district Ruhwald in Berlin, project 1965
Different types of structures
Aesthetics of number
The term "aesthetics of number" is introduced by Aldo van Eyck in the architectural magazine Forum 7/1959. In his article van Eyck showed two works of art: a structuralist painting by the contemporary artist Richard Paul Lohse and a Kuba textile (Bakuba tissue) by an African artist of the "primitive" culture. The combination of these two cultures has a symbolic meaning in the structuralist movement.
Orphanage in Amsterdam, "Aesthetics of Number", 1960 (Aldo van Eyck)
Leicester University Engineering Building, 1963 (Stirling-Gowan)
Salk Institute in La Jolla California, 1965 (Louis Kahn)
Office building Centraal Beheer in Apeldoorn, 1972 (Herman Hertzberger)
Klinikum Aachen, 1971–1985
Office building Banca del Gottardo in Lugano, 1987 (Mario Botta)
Gare do Oriente, Station in Lisbon, 1998 (Santiago Calatrava)
The Children's Monument Yad Vashem Jerusalem, 2005 (Moshe Safdie)
Memorial in Berlin, 2005 (Peter Eisenman)
Structure and coincidence – two-components approach – participation
In the 1960s the structuralists criticised the narrowness of the functional principle "Form Follows Function". In historic cities they found solutions for a new form principle: an interpretable, adaptable and expandable architecture, see below Historic Cities II. In the magazine Forum they developed ideas about "polyvalent form and individual interpretations", "reciprocity of form" and "participation". In our time the notion "open structures" is also used in discussions.
Yamanashi Culture Cham- ber in Kofu, "Interpretable, adaptable and expandab- le", 1967 (Kenzo Tange)
Free University of Berlin, "Structure and Coincidence", Berlin 1973 (Candilis-Josic-Woods)
Medical Faculty Housing, "Participation", Louvain-la-Neuve near Brussels, 1976 (Lucien Kroll)
Urban structuring – The art of town planning – (Overarching structures)
Examples of urban planning and urban structuring. About the relation between historic and contemporary architecture Le Corbusier wrote: "I was labelled a revolutionary, whereas my greatest teacher was the Past. My so-called revolutionary ideas are straight out of the history of architecture itself." Quotation in  No.2.
Barcelona, Gridiron Plan
Manhattan, Gridiron Plan
Rome, Symmetries Axes River Hills etc.
Karlsruhe, Basic structure: Radial
Paris, Radial structure Axes Symmetries River
Washington, D.C., L'Enfant Plan
Amsterdam, Basic structure: U-shape
Venice, Basic structure: S-shape
Historic cities – reciprocity of form
In Forum 2/1962 Jacob Bakema made a study on the principle "reciprocity of form" and "participation", especially on the Diocletian's Palace in Split. In Forum 3/1962 Herman Hertzberger did research on the Roman amphitheatres in Arles and Lucca. Later, in 1966 the idea of the amphitheatre in Arles was taken over by Aldo Rossi in his book The Architecture of the City. In 1976 Reyner Banham presented the Ponte Vecchio in Florence as one of the historic prototypes in his book Megastructure.
New cities in the twentieth century. The term "Urban Structuring" is introduced by Alison and Peter Smithson, the term "Articulations" (of the built volume) by Herman Hertzberger. Both terms are used as a title of an architectural book.
1) "De Drie Hoven" Residential Building for Elderly People in Amsterdam-Slotervaart by Herman Hertzberger, 1974. In the original state, the primary structure was light grey (prefabricated concrete) and the facade elements dark grey and matt (wood construction). Today, the original proportions and colors of the facade elements are changed by the intervention of an unknown architect. Herewith the fine architectural quality of the original building has disappeared.
Literature and annotations
- Aldo van Eyck, "Statement Against Rationalism", written for CIAM VI in 1947. In: Aldo van Eyck - Writings, Amsterdam 2008. Statement against CIAM-formulations like: "Urban planning can never be determined by aesthetic considerations but exclusively by functional conclusions." This formulation came from architects of the Rationalist movement, written for the CIAM-declaration in 1928.
- Tomas Valena (ed.) with Tom Avermaete and Georg Vrachliotis, Structuralism Reloaded - Rule-Based Design in Architecture and Urbanism, Stuttgart-London 2011. 47 articles by Roland Barthes, Herman Hertzberger, Winy Maas et al.
- Aldo van Eyck, "Het Verhaal van een Andere Gedachte" (The Story of Another Idea), with the principle "Aesthetics of Number", in Forum 7/1959, Amsterdam-Hilversum. The editorial team for the magazine Forum 7/1959-3/1963 and July/1967 existed of Aldo van Eyck, Herman Hertzberger, Jacob Bakema et al.
- N. John Habraken, Supports - An Alternative to Mass Housing, London 1972. User Participation. (Dutch edition De Dragers en de Mensen, Amsterdam 1961. German edition Die Träger und die Menschen, The Hague 2000; in combination with: Two-Components-Approach - Structure and Coincidence.)
- Reyner Banham, Megastructure - Urban Futures of the Recent Past, London 1976.
- Max Risselada and Dirk van den Heuvel (eds.), Team 10 - In Search of a Utopia of the Present, Rotterdam 2005. Essays by 23 authors. Interviews with Georges Candilis, Giancarlo De Carlo, Balkrishna Doshi, Ralph Erskine, Herman Hertzberger, Alison and Peter Smithson, Aldo van Eyck.
- Kenzo Tange, "Function, Structure and Symbol, 1966", in: Udo Kultermann, Kenzo Tange, Zurich 1970. Kenzo Tange wrote in 1981: "It was, I believe, around 1959 or in the beginning of the Sixties, that I started to think about what I was later to call structuralism," (Quotation in Plan 2/1982, Amsterdam)
- Arnulf Lüchinger, Structuralism in Architecture and Urban Planning, Stuttgart 1980. Structuralism as an international movement. Including original texts by Herman Hertzberger, Louis Kahn, Le Corbusier, Kenzo Tange, Aldo van Eyck and other members of Team 10.
- Wim van Heuvel, Structuralism in Dutch Architecture, Rotterdam 1992.
- Arnaud Beerends, "Een Structuur voor het Raadhuis van Amsterdam" (A Structure for the Town Hall in Amsterdam), in TABK 1/1969, Heerlen. The architectural terms "Structuralism" and "Structuralists" are published the first time in this magazine, for the Dutch architecture scene.
- Oscar Newman (ed.), CIAM '59 in Otterlo, Stuttgart-London-New York 1961. 30 articles by Louis Kahn, Kenzo Tange, Georges Candilis, Jacob Bakema, Aldo van Eyck, Alison and Peter Smithson et al., (English+German supplement). The Otterlo congres is considered the official start of the structuralist movement.
- Herman Hertzberger, Lessons for Students in Architecture, Rotterdam 1991-No.1, 2000-No.2, 2008-No.3. Definition by Herman Hertzberger: "Structuralism deals with the difference of a structure with a long life-cycle and infills with shorter life-cycles."
- Thomas Valena, Tom Avermaete, and Georg Vrachliotis. Structuralism Reloaded: Rule-based Design in Architecture and Urbanism. Stuttgart: Edition A. Menges, 2011.
- Justus Dahinden, Stadtstrukturen für morgen (Urban Structures for the Future), Stuttgart 1971, London-New York 1972.
- Francis Strauven, Aldo van Eyck - The Shape of Relativity, Amsterdam 1998.
- Michael Hecker, Structurel-Structural, Structuralist Theory in Architecture and Urbanism 1959-1975, thesis Stuttgart University of Technology, Stuttgart 2007.
- Sabrina van der Ley and Markus Richter (eds.), Megastructure Reloaded - Visionary Architecture and Urban Design of the Sixties reflected by Contemporary Artists, Ostfildern near Stuttgart 2008. 25 articles about Archigram, Yona Friedman, Eckhard Schulze-Fielitz, Constant et al., (German+English).
- Mark Garcia (guest-ed.), "Patterns of Architecture", in: Architectural Design November/December 2009, London.
- Rivka Oxman and Robert Oxman (guest-eds.), "The New Structuralism - Design, Engineering and Architectural Technologies", in: Architectural Design July/August 2010, London.