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Knowledge Cats Dirty Minds
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Knowledge

Facts, science and history of optical illusions.
See all the articles or scroll down to see what you came for.

sorrowful rock face pareidolia

How do optical illusions work?

Bezold effect fabric

Bezold Effect

Prehistoric ambiguous illusion

The history of optical illusions in art

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:

If it fits...
Fire demon
Impaled windshield
Lake View Garden
Assorted Dried Beans
Pixeled sky
Flying Dutchman
Reflected rice fields
  • 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