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The Penrose triangle, also known as an impossible triangle or tribar, is a visual representation of a triangular frame that could not exist in three-dimensional space. It is named after the English psychologist and geneticist Lionel Penrose and his son the mathematical physicist Roger Penrose, who published a version of it in the February 1958 issue of the British Journal of Psychology.[1][2]
Unknown to the Penroses, however, the tribar had been earlier depicted as an impossible arrangement of nine cubes by the Swedish artist Oscar Reutersvärd (1915–2001) in 1934.[1]
Three-dimensional solid shapes can be constructed which, when viewed from a certain angle, appear to be Penrose triangles, such as the public sculpture Impossible Triangle, unveiled in Perth, Western Australia in 1999.[3]
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