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Facts, science and history of optical illusions.
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Ambiguous illusions

Bezold Effect

Inferior and Superior Mirages, and Fata Morgana

Pixeled sky

Source/credit: Wolfcubware

The pixeled sky is reflected on the skyscraper at the end of the street. At the bottom of the building, you can see the reflections of the yellow buildings as well.

More optical illusions:

Glitch in the Matrix

Advertizing

Checkered shadow

Shadows