Impossible cube

In Escher's Belvedere a boy seated at the foot of a building holds an impossible cube.

[1][2] Other artists than Escher, including Jos De Mey, have also made artworks featuring the impossible cube.

[3] A doctored photograph purporting to be of an impossible cube was published in the June 1966 issue of Scientific American, where it was called a "Freemish crate".

The illusion plays on the human eye's interpretation of two-dimensional pictures as three-dimensional objects.

It is possible for three-dimensional objects to have the visual appearance of the impossible cube when seen from certain angles, either by making carefully placed cuts in the supposedly solid beams or by using forced perspective, but human experience with right-angled objects makes the impossible appearance seem more likely than the reality.