Penrose triangle

English

Penrose triangle

Etymology

After Roger Penrose (1931-), English mathematician, who popularised it in the 1950s.

Noun

Penrose triangle (plural Penrose triangles)

1. An optical illusion depicting an impossible solid object made of three straight beams of square cross section which meet pairwise at right angles at the vertices of the triangle they form.

See also

• Necker cube