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Facts, science and history of optical illusions.
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Is this a bird or a rabbit?

Ambiguous illusions

sorrowful rock face pareidolia

How do optical illusions work?

Prehistoric ambiguous illusion

The history of optical illusions in art

UFO

UFO ready for takeoff

Source/credit: Александр Лубянченко

Krestovsky Stadium in St. Petersburg on the first day of spring

 

More optical illusions:

Cat's face
Beautiful Caterpillar
Giant Christmas Cat
Pup Patrol
Big cat on the roof
Bushfire
Sunken Yacht
110 pound squirrel
  • Pareidolia
  • Physical illusions
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Sand bear

Sand Bear

Animals

Exotic golden bird

Exotic Bird

Birds