eli5 how do those illusion videos work where you close your eyes after staring at a dot and are able to see the picture?

Question

eli5 how do those illusion videos work where you close your eyes after staring at a dot and are able to see the picture?

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Answer 1

The receptors become fatigued from staring at that color.

Stare at a gray carpet for a while, and things will become blurry and look like somethings crawling all over it.

This is also how the negative illusion works.

You stare at the negative, and your receptors become fatigued to its colors

Then you look at a white space, and you’ll see the inverse of the negative