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Knowledge

Facts, science and history of optical illusions.
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Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

The Dress blue black white gold

Color Constancy Illusions

Is this a bird or a rabbit?

Ambiguous illusions

Swamp monster

Penrhyn Castle in Wales looks like a swamp monster

Credit: Alan Moore

This is inside Penrhyn Castle in Wales. The windows in the dome look like the eyes of a swamp monster, in a classic case of pareidolia.

More optical illusions:

Giant Cat
Cup Half Full
Bar Stools
Giant Broccoli
Floor Color Creates Extra Dimension
Floating helmet and wheel
Big Dog
Highway Loop
  • Pareidolia
  • Physical illusions
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Strained Expression

Objects

This photo was taken in Kazakhstan and quickly named 'Eye of God' by people online. Obviously, this is just a case of pareidolia.

Eye of God

Clouds