Same Color Illusion

The same color illusion — also known as Adelson's checker shadow illusion, checker shadow illusion and checker shadow — is an optical illusion published by Edward H. Adelson, Professor of Vision Science at MIT in 1995.The squares A and B on the illusion are the same color (or shade), although they seem to be different. This can be proven by copying the image into an art program and sampling the color of A and then of B, which will show that they are in fact the same color.

"When interpreted as a 3-dimensional scene, our visual system immediately estimates a lighting vector and uses this to judge the property of the material."

The left image below shows what appears to be a black and white checker-board with a green cylinder resting on it that casts a shadow diagonally across the middle of the...........

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