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Knowledge

Facts, science and history of optical illusions.
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Squirrel Stereogram

Stereograms

Forced perspective image Pisa tower

Forced Perspective

Can animals see optical illusions? Hosico cat shows it with optical illusion rug

Animals and optical illusions

The same image

concave and convex

Source/credit: EndersGame_Reviewer

The photos on the left and right are the same image, just rotated. The reason that we see the one on the left as concave and the one on the right as convex is because our brains assume that light is coming from above. 

More optical illusions:

Hand through a cat
PM Hummingbird
Magayon and Pangaronon
Portal
Smile!
Sun Dogs
Echidna kitten
God of all Cats
  • Pareidolia
  • Physical illusions
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Lego bed

A Lego bed

Objects

Pisa tower on the right leans more

Which one leans more?

Landmarks