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	Are the V's of the Y's horizontally aligned? © Akiyoshi Kitaoka: Used with permission.. Print Illusion

An optical illusion is difference between reality and what the brain thinks its seeing. The information gathered by the eye is processed in the brain to give a image that does not agree with a physical measurement of the source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, colour, movement), and cognitive illusions where the eye and brain make unconscious inferences.

Top 10 Illusions

Impossible triangle?   Black and white dots?   Are these cafe wall lines parallel?   A lovely vase?

Shadow illusion?   Level balance?   Same length red lines?

Can you tell what it is?   Spinning dancer   Purple Nurple