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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.

Forced perspective image Pisa tower

Forced Perspective

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Squirrel Stereogram

Stereograms

Schrödinger’s Scat

Schrödinger's Scat

Source/credit: Reddit

Is the cat pooping or not pooping? It is Schrödinger’s Scat.
This optical illusion is caused by a reflection. The cat is behind the glass and the litter box is in front of the glass.

More optical illusions:

Paperthin Building
Big cat on the roof
Up or Down?
Rock Climbing
Cat a log
Enormous cat napping
Reflective bird
Solar Eclipse
  • Pareidolia
  • Physical illusions
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Portal in an abandoned hotel

Portal

Buildings

Floating helmet

Floating helmet and wheel

Cars