Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...
9don MSN
This geometrical optical illusion is hiding a secret alphanumeric—can you find it in 5 seconds?
What Is an Optical Illusion? An optical illusion is a visual phenomenon where the brain misinterprets what the eyes see.
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