Chequer-shadow Illusion

This illusion has been around for a while, and we were recently reminded of it again by Chris Stevenson, from London.

Hard as it may be to believe, the two squares A and B are actually the same colour. There are different ways of proving this, and we have seen some elegant solutions.

Edward H Adelson is Professor of Vision Science at MIT, and is the creator of this illusion. If you want to know how it works, you will have to visit his site...

Grand Illusions Toy Shop

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