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World's Oldest Optical Illusion Found?

Prehistoric artists may have been creating mind-bending optical illusions thousands of years ago. Duncan Caldwell found a recurring theme in Paleolithic cave art that he says can't possibly be accidental.

In these images, drawings and engravings of woolly mammoths and bison share lines to create overlapping images that can be read first as one animal, then the other.

To see examples of these prehistoric visual tricks, you can click on the link below.

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