Penrose Triangle
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This example of the "impossible figure" of the Penrose triangle is a perspective view of a real three-dimensional object. Rotate it by dragging.
Contributed by: Ralf Schaper (March 2011)
Open content licensed under CC BY-NC-SA
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"Penrose Triangle"
http://demonstrations.wolfram.com/PenroseTriangle/
Wolfram Demonstrations Project
Published: March 7 2011