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Penrose triangle


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An impossible figure of a solid triangular frame that could not exist in actual space although each of its corners, considered on its own, is feasibly constructed (see illustration). Also called an impossible triangle or a tribar. The first recognizable version of it was depicted in 1934 as an impossible arrangement of nine cubes by the Swedish artist Oscar Reutersvärd (1915–2001) and was used as a design for a postage stamp issued in Sweden in 1982. [Named after the English psychologist/geneticist Lionel S. Penrose (1898–1972) and his mathematical physicist son Roger Penrose (born 1931) who, unaware of Reutersvärd's earlier work, published a version of it in 1958]

Penrose triangle

Subjects: Psychology.


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