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Light on an Impossible Object

The "impossible triangle" of Oscar Reutersvärd is constructed as a three-dimensional object. Move the light source and modify the opacity to understand the construction. If you do not understand, move the object!

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Swedish artist Oscar Reutersvärd is the "father of impossible figures". He was the first to deliberately make impossible figures.

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"Light on an Impossible Object" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/LightOnAnImpossibleObject/
Contributed by: Bernard Vuilleumier
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