Knowledge

Facts, science and history of optical illusions.
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Can animals see optical illusions? Hosico cat shows it with optical illusion rug

How do optical illusions work?

Checkered shadows

Source/credit: Reddit

Why are there checkered shadows under LED street lights?

These pixelated or checkered shadows occur because modern LED street light fixtures use a grid array of multiple individual LED diodes rather than a single light source. Light from the different diodes overlap, creating different shades.

More optical illusions:

Scale Model of a Courtyard

Blend with nature

Headless figure

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