Body Chair @ Design Days Dubai and Salone di Mobile 2017

Body Chair BYYU 30.1 fabric | design Kas Oosterhuis | production BYYU | 2016

The Body Chair is shown at Dubai Design Days in Design District D3 from 13-17 March 2017, presented by the Dutch Creative Industry [DCI] in 3 bespoke configurations: BYYU 30 FABRIC, BYYU 60 WOOD and BYYU 60 MONDRIAN, and at the Salone di Mobile from 4-9 April, presented by Masterly at the Palazzo Francesco Turati in the center of Milan.

The Body Chair is produced by BYYU ltd, a company of Hieselaar Nederland bv in Schoonhoven, Netherlands.

Body Chair BYYU 60.2 wood | design Kas Oosterhuis | production BYYU | 2016
Body Cahir BYYU 90.2 raw | design Kas Oosterhuis | production BYYU | 2016

anonymous quote: “The Rietveld Chair of the 21st century”

contact details

Kas Oosterhuis architect | email  | web |

press kit available on Dropbox:

Parametric design is not a style

The title of this blog leaves no doubt. I am not a fan of parametricism, while everything we do at my innovation studio ONL and at my chair Hyperbody at the TU Delft is fundamentally parametric. I will explain why. I do not think that it is a matter of definitions, but a matter of understanding of what parametric design is about. It certainly is not a style, and it should never be seen as such. In his lecture at the symposium Artificial Intuition [1990] of which I managed the content at the Faculty of Architecture at the TU Delft Robert Aish told us that parametric design was something he was doing already back in the seventies while working for a Polish shipbuilder. Since a ship does not have a repetitive section through its body due to the streamline of the ship he developed a detail of which the values would adapt to their changing position in the body. That is parametric indeed, although Aish had a better word for it, he named it Associative Modelling. Parametric design means modelling associations between the components, which a ship or a building is made of. Associations are a form of dynamic entanglement. When one part changes its values, the associated parts change with it.

Bidirectional relationship

Since the early nineties my short definition of parametric design is the art of establishing dynamic relationships. Adaptive relationships of parts to parts, of things to things, of objects to objects, whether in the virtual realm or in the materialized world. Related to parametric design, but not the same, is interactive architecture, which I define as the real time relationships of people to things, and the other way round. Relationships are per definition bidirectional and never static. Relationships are constructed by acting in a complex adaptive system. Such is the case with parametric design, a parametric relationship acts both ways and in multiple ways.

apollo soyuz connection |  1975
apollo soyuz connection | 1975

Apollo < > Soyuz

An associative relationship does not necessarily mean that the neighboring part is similar in its shape or dimensions. Entangled parts can be of a different family and of a different order. I can illustrate this with my favourite yet one-dimensional form of a parametric relationship, which is the relation between the Soviet Soyuz and the American Apollo capsules docking in space. This happened back in the seventies of last century and it was a huge accomplishment, and of high political and technical importance. American and Russians embarked on a shared process of exchanging visions, views and data, eventually leading to the agreement on one single common docking ring. It basically meant that the Soyuz and the Apollo fitted exactly, in one moment in time, at one specific location, with one specific set of shapes and dimensions. It is this exactness of the association that is key to parametric design. In the world of parametric design one establishes exact relationships between parts, entangled as to adapt to the variations of the neighboring part.

ruling curves | waterpavilion | ONL 1997
ruling curves | waterpavilion | ONL 1997


While designing the Waterpavilion [ONL, 1997] we linked the reference points on the main 8 curves, define the geometry of the sculpture building, to the reference points of the steel structure, to the skin and the continuous variable fins gradually emerging out of the main body to emphasize the curvature. Structure, skin and featured fins were linked into one coherent parametric system. Associatively linked since in each instance on the curve the relative values of their mutual distances and angles would change with their positions along the curve. These relationships were not modeled in a existing CAD program but scripted from scratch using Autolisp routines. Drawings and 3d models are meaningless in a dynamic parametric world. The associations are defined with formulas and algorithms, describing their mutual relationships. Scripting is a very lean method of design, consuming very little data, exported to and retrieved from a database.


What is often considered as a parametric design is mostly nothing more than a fashionable form of tessellation of the surface, covering only a literally superficial part of the design / building. The real power of parametric design is to link all constituting components to each other, including floor, wall, roof such that when And staying within the limitations of such a mono-culture of similar yet not the same parts, one could indeed speak of a style, largely subject to fashion and voluntary follower of built-in commands of certain design software. Yet it would be unjust to the full potential of parametric design to declare the superficial qualities of being similar yet not the same a mainstream design movement, whether or not labelled as parametricism. To do that is a populist act, not respecting what are the underlying values. I remember having stated in my letter to Alvin Boyarsky describing my vision as unit master at the Architectural Association [AA] in London [1988-1989], that I reject all -isms. Then my rebellion was against modernism and its counterpart post-modernism, constructivism and its counterpart de-constructivism, both of which were deeply adhered to at that time at the AA. But I wanted no more -isms. So it may not be surprising that I became allergic to the term parametricism, which is nothing more than an attempt of Patrick Schumacher to become the founder and leader of a populist movement, feeding upon the supramatist sometimes bigoted calligrahic sweeps by the late Zaha Hadid [read my blog Calligraphic Sweeps]. His attempt to establish a mainstream movement would be more appropriately labeled patricism, more than anything else.

parametric GFA structure and skin | LIWA tower | ONL 2014
parametric GFA structure and skin | LIWA tower | ONL 2014

LIWA tower

While modernism is an attitude which attempts to look modern, yet in its essence is not modern but retro-actively looking like something modern, and constructivism is an attempt to look like a logical structure but in fact isn’t, the container term parametricism is fit for designs that look parametric but not necessarily are parametric. I feel that it is important to make the distinction. For example the Reiser Umemoto Swiss Cheese tower in Business Bay in Dubai [2014] may be considered parametric, while it is not parametric at all. Yes, it features 5 different sizes of openings in the concrete exoskeleton in a seemingly random fashion, but that is exactly why it is not parametric. In a parametric design all openings would have been unique in their shape, any sameness would be a pure co-incidence. at the other end however, ONL’s LIWA tower is by and large parametric, linking the curved geometry drivers to the Gross Floor Area [GFA] calculations, to the steel structure and to the skin in one coherent relational system. All windows of the LIWA tower are unique in shape and dimensions, all structural X-crosses are unique in shape and dimension, and both systems are parametrically linked to each other. Changing the position of one reference point on the curve changes all windows and steel components on at least two ruled surfaces of the body wrap, while maintaining the set value for the GFA.

Genetic structure

Parametric design systems must and can be developed further, until the point that all constituting components have become an acting part of the system. Building components are seen as actors in a dynamic and open relational design system. The design that comes close to this point is ONL’s BYYU Body Chair, where all bits and pieces are associated part in one coherent complex adaptive system, where at the front end the customer can set individual preferences, while at the back end the design is directly linked to the data driven robotic waterjet-cut production of the pieces. Only when having a fully functional parametric design system one can establish such direct link from design to production, from customer to end-user, which explains the relevance of treating parametric design systems not as something it looks like, but as something what it is deep down in its genetic structure.

004 | protoCELL

protoCELL_parametric building blocks_Hyperbody 2010
protoCELL_parametric building blocks_Hyperbody 2010

004 protoCELL

The protoSPACE lab 2.0 in the iWEB has to close down due to the 2008 fire, which destroyed the Faculty of Architecture. In pring 2010 we opened protoSPACE 3.0 inside the walls of a new BK City. In the 2009 MSc2 course Hyperbody students designed a new protoSPACE 4.0 lab, a standalone pavilion between BK City and the Delft Science Centre. For protoSPACE 4.0 we developed a complete new building system based on an assemblage of large unique CNC produced building blocks. The prototypical building block we named protoCELL. The parametric protoCELL unit comes in a series of interacting function-specific swarms: daylight swarm, artificial light swarm, ventilation swarm, interaction swarm, heating swarm, display swarm. Each featured swarm consists of 10-20 parametric building components. The different swarms interact in a loose configuration, intermingling the specified functional units, but never betraying to which swarm one belongs. the units are CNC milled from polystyrene foam and coated with a strong polyurea skin. All building blocks of all swarms are structural as well as provide for insulation. The hundred large building blocks of the proposed protoSPACE 4.0 fit together like the unique pieces of a 3d puzzle. The gravity center of the units form the point cloud of reference points. The reference points are further specified as to form the details of the geometric relations between the units. Each reference points thus becomes a group of parametric related points.

002_Point Cloud

point cloud of reference points_A2 Sound Barrier_2015
point cloud of reference points_A2 Sound Barrier_VAA.ONL 2015

002 Point Cloud Acoustic Barrier / A2 Cockpit

In 1998 we got commissioned by Nora Hugenholtz of Projectbureau Leidsche Rijn the design of a 1.6 km long acoustic barrier along the A2 highway, and we were asked to think about how to represent the commercial firms behind the barrier. We applied the strategy of multiple use of the ground, and proposed to embed a substantially bi building in the very volume of the barrier. In fact we considered the barrier and the A2 Cockpit building – as we proposed to brand it – as one continuous structure, only to pump up its volume where it was needed. Intuitively we combined many strategies into one coherent structure. Only because we described the project conceptually as one unified entity, we could take the logical consequence and develop one organizational structure for the whole project, including the flattened and cantilevering endings and the expanded Cockpit bubble. We came up with the concept to establish a point cloud of thousands of reference points. The points featured an exact position in space, which enabled us to write a script describing all constituting building components with high precision. It was unprecedented at that time, and still is unique that an architect actually controls the complex geometry in such high precision that the manufacturer – Meijers Staalbouw – can use the architect’s data for the CNC production. All components, steel, glass and rubber are customized to the extreme. Each and every component is different in its dimensions and its shape. The radical file to factory [F2F] process of mass customization was born. We have applied it ever since.