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Knowledge Cats Dirty Minds
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Knowledge

Facts, science and history of optical illusions.
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Forced perspective image Pisa tower

Forced Perspective

Bezold effect fabric

Bezold Effect

Locomotives in their natural habitat

Pareidolia (Seeing faces)

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:

Snake cat
Pup Patrol
Phoenix rising
Giant bullfrog
LEGO brick floor
Swamp monster
Big Seagull
NASA doctored photos?
  • 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