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Knowledge

Facts, science and history of optical illusions.
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The Dress blue black white gold

Color Constancy Illusions

Is this a bird or a rabbit?

Ambiguous illusions

Squirrel Stereogram

Stereograms

Hidden ad in advertisement page

Hidden ad in the shape of a kitchen in newspaper

Source/credit: Filipe Salazar and Karen Castañeda

Can you the kitchen build into this newspaper? It is a hidden ad.

The advertisement page of this newspaper is used as a giant ad for HiperCentro Corona, a Colombian company selling construction materials. 

More optical illusions:

Water drop
Square Fire Hydrant
Mind-boggling Floor
Goblin spy on a plane
Next to the boat
Smile!
Big Daddy
Boiling a bird
  • Pareidolia
  • Physical illusions
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Missing Chair Leg

Chairs

The indentations look like footprints in the sand or artificial leather.

Artificial Leather

Nature