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| | Impossible triangle |
 | | In 1954 Escher had not yet created his three impossible prints: "Belvedere," "Ascending and Descending," and "Waterfall." Penrose was also unfamiliar with the work of Reutersvärd, Piranesi, and others who had created impossible figures previously. |
 | | In 1954 physicist Roger Penrose, after attending a lecture by the Dutch graphic artist M. Escher, rediscovered the impossible triangle and drew it in its most familiar form, which he published and popularized in a 1958 article, co-authored with his father Lionel Penrose, that appeared in the British Journal of Psychology. |
 | | Penrose, who was stimulated by Escher's work, wanted to create something that illustrated an impossibility in its purest form. |
| www.noordnet.net /optical_illusion/triangle.html (782 words) |
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