#152 : Straight Lines?

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 [#153]
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#152 - Print Illusion
Is the chequerboard straight?
Answer:
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 [#151]
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An optical illusion is the 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.

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