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Knowledge Cats Dirty Minds
Clouds Shadows Birds

Knowledge

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

Parallax effect

Parallax Effect

Rorscharch inkblot

What Optical Illusions Reveal about You

Is this a bird or a rabbit?

Ambiguous illusions

The Invasion

Street in Macau

Source/credit: Paul Tsui and National Geographic

This picture was entered into National Geographic travel photo competition by Paul Tsui. It depicts a real scene of Macau, with the Grand Lisboa Hotel looming in the background. 

More optical illusions:

Lake View Garden
Big bottoms
The Grinch
Bride Waterfall
Hidden ad in advertisement page
Flying cat
Echidna kitten
Rock Climbing
  • Pareidolia
  • Physical illusions
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Zombies attack

Zombie Attack

Zombies

Find the cat

Cat a log

Cats