Artists: Rene Magritte
This painting utilizes a technique like that of the Schuster fork, and illustrates how the mind constructs the impossibility. The mind puts together the separate elements into a "coherent" whole of these parts. The horse is thus bisected by a patch of background grass. Also, one of the tree trunks is in front of the horse but its base is behind the horse. It certainly seems that these elements are inconsistent with our conception of a rider in a forest. For example, it qualifies as an occlusion illusion, since reversal of occlusions is sufficient to produce a consistent image.