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Knowledge Cats Dirty Minds
the tag: Cognitive Illusions Hidden objects Camouflage and Mimicry

Knowledge

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

Bezold effect fabric

Bezold Effect

Squirrel Stereogram

Stereograms

Expanding Black Hole Illusion

Mind-blowing facts about optical illusions

Wall drilling illusion

Source/credit: Wahajube

This wall drilling illusion is very hard to understand:

The shadow below the drilled block is not from that block, but instead from something outside the frame, further in the background.

The block being drilled is right above the man drilling it.

More optical illusions:

Thats the cat's pajamas
Parquet Floor
Giant bullfrog
A Whale of a Cloud
Bird Strike
Stretchy Cat
Tetanus Rainbow
Separation
  • Pareidolia
  • Physical illusions
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This is an optical illusion artwork by Kostya Terentev. Filmed from directly above, you can see only the shadows of the people.

Shadow Avatars

Shadows

Dog jumping giant hole illusion

Dog jumping a giant hole

Dogs