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Lean images

kingdom.jpgThe two images of the Leaning Tower of Pisa are identical, yet one has the impression that the tower on the right leans more, as if photographed from a different angle.

So say Ali Yoonessi and Elena Gheorghiu of their winning entry in the 3rd annual Best Visual Illusion of the Year Contest.

(Thanks to investigator Cathy Harris-Caldwell for bringing this to our attention.)

Improbable Research