Building M.C. Escher with a 3D Printer

(Video Link) 

Computer science researchers at Technion--Israel Institute of Technology found that they could design physical models of that resemble M.C. Escher's complex, impossible objects--provided that you look at them from the right perspective. They used a 3D printer to build them, such as the above model of Belvedere.

Link -via Nerdcore