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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?

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Squirrel Stereogram

Stereograms

A Starry Night Sky

A starry night sky optical illusion

Source/credit: LucyDreads

This starry night sky is actually a reflection of a puddle with gravel in it. The picture is taken in the daytime. However, the darkness of the puddle creates the optical illusion of a night time photo. 

More optical illusions:

Dude, where is my car?
Transparent coffee cup
Hidden cat
Bushfire
Nature's Dance
Baby Bigfoot
Sunken Yacht
Cat Accident
  • Pareidolia
  • Physical illusions
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Jupiter close-up

Jupiter

Nature

Pipe cleaner Arms

Pipe Cleaner Arms

Cats