Knowledge

Facts, science and history of optical illusions.
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Forced Perspective

Color Constancy Illusions

Pareidolia (Seeing faces)

The Grinch

Source/credit: marmusha

This Grinch illusion is a grumpy cat looking out of the window. His reflection fits nicely onto the Chrismas tree outside, making him look like the Grinch.

More optical illusions:

A Giant on the Beach

Bending the Walls

Giant Party in the Skyline

Bird in the Sky

Scale Model of a Courtyard

Floating tree

Misbehaving Shadow

Beach Yeti

Snake cat

Cats

Flying cat

Cats