One of the reasons I've been out here in the states is so that our two offices can share info about our work processes. One of the differences between the two offices is their use of computer modeling at various stages of the design process. Our US office uses a CAD system called Freeform which uses a haptic feedback stylus (shown below). The stulus is used as a tool in 3D space to sculpt the model. The haptic feedback element means that you can literally feel the "clay's" resistance in virtual space when pushing the tool into it. Neat eh?