1952, Woodcut print

Dragon is one of Escher’s experiments with flatness. The piece, which is of course two-dimensional on its own, features a dragon whose shading is enough to make it look three-dimensional and realistic. But on closer inspection, the viewer can see that slits were cut in the dragon’s body for it’s head and tail to pass through and intersect—thus proving that, although the dragon looks 3D, it is actually drawn to represent a 2D image.