The uncanny Photosketch tool was not the only magic software tool debuting at Siggraph Asia 2009. This amorphous Lego volume can magically throw three different object shadows thanks to a program called Shadow Art. See it in action here.
According to developers Niloy J. Mitra and Mark Pauly, Shadow Art is a tool to create abstract sculptures that can cast three different shadows, depending on the angle they are oriented against the light source. These sculptures can be built in the physical world with any material, not only Lego, as well as used in 3D-rendering programs to achieve the same effect. [Shadow Art via bldgblog]