## Penrose triangleIn 1954, Roger Penrose, after attending a lecture by the artist M. C. Escher, rediscovered the impossible triangle and drew it in its most familiar form, which he published in a 1958 article in the British Journal of Psychology,
coauthored with his father Lionel.^{1} Penrose was also unfamiliar
with the work of Reutersvärd, Piranesi, and others who had created impossible
figures previously. Penrose's impossible triangle, unlike Reutersvärd's
earlier version, was drawn in perspective, which added an additional size
paradox to the object. In 1961, Escher, inspired by Penrose's version of
the impossible triangle (he was sent a copy of the article by the Penroses),
incorporated it into his famous lithograph "Waterfall." ## Reference- Penrose, L.S., and Penrose, R. "Impossible Objects: A Special Type
of Illusion,"
*British Journal of Psychology*, 49: 31, 1958.
## Related category• ILLUSIONS AND IMPOSSIBLE FIGURES | ||||||

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