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Facts, science and history of optical illusions.
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The history of optical illusions in art

The eye of the tower

Source/credit: Nordic110

This eye of the tower is watching over Verona, from the 84 meter high Torre dei Lamberti. It is a typical case of pareidolia. Many photographers have noticed the optical illusion in the staircase of the tower, but this picture by Nordic110 illustrates it the best.