Light on an Impossible Object

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The "impossible triangle" of Oscar Reutersvärd is constructed as a threeâÂÂdimensional object. Move the light source and modify the opacity to understand the construction. If you do not understand, move the object!
Contributed by: Bernard Vuilleumier (March 2011)
Open content licensed under CC BY-NC-SA
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Swedish artist Oscar Reutersvärd is the "father of impossible figures". He was the first to deliberately make impossible figures.
Permanent Citation
"Light on an Impossible Object"
http://demonstrations.wolfram.com/LightOnAnImpossibleObject/
Wolfram Demonstrations Project
Published: March 7 2011