A device for the simultaneous modeling and rendering of three-dimensional objects on a computer display through a tactile user input. The tactile user input consists in part of a closed solid surface. The preferred form of this surface is a ball. This ball is enveloped by a plurality of sensors, all...http://www.google.es/patents/US5666473?utm_source=gb-gplus-sharePatente US5666473 - Tactile computer aided sculpting device
