TAC.TILES is a physical interface that can be used for 3D modeling. The interface consists of 15 modules which can be put together according to the user’s preferences. Each of these modules brings a change in the shape of the 3D model. The advantage of this physical interface is that the user can design in a pleasant and intuitive way.
http://www.core77.com/projects/67575/A-3D-Modeling-Interface-that-Allows-More-Interaction-and-Customization-in-the-Design-Process