Knowledge

Facts, science and history of optical illusions.
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How do optical illusions work?

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

Animals and optical illusions

Inferior and Superior Mirages, and Fata Morgana

Dogs sharing a mouth

Source/credit: BeanzMeanzBranston

These two good boys seems to blend. With the same fur it is hard to distinguish where one dog ends and the other begins. But this is the solution to this optical illusion:

Two dogs optical illusion solution — Imgur

More optical illusions:

Escher drawing IRL

Cars

Beautiful Caterpillar

Birds