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Probability: Fallacies, Myths and Puzzles: Main Page

Curved Lines?

The so called-café wall illusion was first described by Gregory and  Heard after seeing effect in the tiles of the wall of a café in Bristol. The
lines appear to be bent but are straight (just hold a strait edge along them to prove it).


cafe wall

A similar illusion is the apparently 'bugling checkerboard'. Again all the lines are straight.

bulging


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Norman Fenton


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