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Knowledge Cats Dirty Minds
Ghosts Trees Chairs

Knowledge

Facts, science and history of optical illusions.
See all the articles or scroll down to see what you came for.

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Expanding Black Hole Illusion

Mind-blowing facts about optical illusions

How to create optical illusion photos (for social media)

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:

Misaligned Arrow
Eye of a tree
Half Assed
Floating Dog
Cat Anus
Missing paw
The Pensive Olive Tree
Flying Dutchman
  • 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