Escher's Dodecahedron

Source: Wikipedia

Reptiles is a work by M. C. Escher first printed in March 1943. "It depicts a desk on which is a drawing of a tessellated pattern of reptiles. The reptiles at one edge of the drawing come to life and crawl around the desk and over the objects on it to eventually re-enter the drawing at its opposite edge. The desk is littered with ordinary objects, as well as a metal dodecahedron that the reptiles climb over."