Knowledge

Facts, science and history of optical illusions.
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Mind-blowing facts about optical illusions

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

Animals and optical illusions

Inferior and Superior Mirages, and Fata Morgana

Wolf pack

Original credit: lost on the internet

At first glance, it looks like a book about a happy wolf pack with the wolf on the left probing the one on the right, but when you switch your focus, you can see it is not a paw but a tail.

More optical illusions:

Too many legs

People

Kamasutree

a dirty mind