One project is not comparable to the next; it is unique. The situation is unique, the programme is unique, the site is unique, and therefore the idea that drives the design, the force that drives the design, has to be generated around that locus of circumstances. We have a model shop where we build models to test different strategies. In the models, we use materials according to the design concept. The conceptual idea driving the design has a materiality. It’s different for every project.