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Knowledge Cats Dirty Minds
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Knowledge

Facts, science and history of optical illusions.
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sorrowful rock face pareidolia

How do optical illusions work?

Bezold effect fabric

Bezold Effect

Forced perspective image Pisa tower

Forced Perspective

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:

Best for Stairs
Dogs sharing a mouth
Baby Bigfoot
Toy Cars
Skywalker
Gmork
Flying Cargo Ship
Legs up
  • 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