Knowledge Cats Dirty Minds

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Knowledge

Facts, science and history of optical illusions.
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Superior mirages

Inferior and Superior Mirages, and Fata Morgana

Locomotives in their natural habitat

Pareidolia (Seeing faces)

Parallax effect

Parallax Effect

Wall drilling illusion

Source/credit: Wahajube

This wall drilling illusion is very hard to understand:

The shadow below the drilled block is not from that block, but instead from something outside the frame, further in the background.

The block being drilled is right above the man drilling it.

More optical illusions:

Parked too long?

What Big Teeth you Have

Tetanus Rainbow

Floating Baby Boy

This is an optical illusion artwork by Kostya Terentev. Filmed from directly above, you can see only the shadows of the people.

Shadow Avatars

Shadows

Dog jumping giant hole illusion

Dog jumping a giant hole

Dogs