The architect’s task: the use of models as structural expressionism

In the above cited quote, Kevin Roche, a principal associate at Eero Saarinen’s architectural practice in 1957, recalls an early morning discussion about the design of the Trans World Airlines’ (TWA) Flight Center. Roche’s story about Saarinen reminds us that at the beginning of an architectural project, a solution may come from any variety of sources, not least of all from everyday objects. This was certainly the case for Saarinen, who found the seed for his design of the structural shells of the TWA Flight Center in the rind of a grapefruit. Despite its seeming novelty, Saarinen is not unique in his approach to the generation of architectural form with models; the Greek-French composer, architect and engineer Iannis Xenakis, who while working with Le Corbusier in 1957, used strings and thick wire to design the hyperbolic shell for their Philips Pavilion at the 1958 Brussels Expo. That a model will play a defining role in an architect’s approach to structural design is also demonstrated by the ‘spherical solution’ that Jørn Utzon discovered while stacking models of his Sydney Opera House’s shell roofs. These explorations with the expression of structure emerged at a time when a new generation of designers, including Eduardo Torroja, Pier Luigi Nervi and Felix Candela, had realised a handful of buildings using models to study and test structural form.