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 in 1995. The squares A and B on the illusion are of the same color (or shade), although they seem to be different.

"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."

Squares A and B have the same color.

The image below proves that the squares A and B have the same color.

File:Same color illusion proof.png

The part between the red lines is copied to show that the squares A and B really have the same color.

As a further example, the two "A"s are both the same color and do not change. The shadow is removed in two frames, and the colors of the chess board are reversed.

The two squares marked A have the same color.

See also

• Chubb illusion
• Lilac chaser

External links

• Explanation of the effect
• Illusion of colours

Credits

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