Computer scientist Gershon Elber of the Technion Israel Institute of Technology used 3D printers to create marvelous physical models of MC Escher's artwork. 3D printers, like those from Z Corporation, squirt out powdered plastic and binder layer-by-layer based on a CAD model. Link (via Reality Carnival)
UC Berkeley computer scientist Carlo Séquin also uses 3D printers to produce beautiful abstract sculptures. Link