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Knowledge Cats Dirty Minds
Geometry Videos Clouds

Knowledge

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

Expanding Black Hole Illusion

Mind-blowing facts about optical illusions

Is this a bird or a rabbit?

Ambiguous illusions

Squirrel Stereogram

Stereograms

Tree Mural

Tree mural

Source/credit: Liamers

This tree mural is actually the shadows of two different trees. The branches of the mural are created by the tree in the image. But the foliage comes from a tree behind the photographer. You can see its trunk on the ground.

More optical illusions:

Angel
Afro tree
Music Notes
Legs up
Footprint in the sand
North Sentinel Tribesman
A sorrowful rock
Peacock with its head in the ground
  • Pareidolia
  • Physical illusions
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Canoeing in a winter wonderland

Canoe in the Winter

Nature

Half cup

Cup Half Full

Objects