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 Optical illusion causing the brain to interpret colors wrongly.
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 Optical illusion - the red-orange lines are strictly horizontal/vertical, and fully parallel/perpendicular to each other
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 Simultaneous Contrast Illusion. The horizontal grey bar is the same shade throughout.
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 All lines and edges are strictly horizontal/vertical, and fully parallel/perpendicular to each other
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 The edges between the diamond-shaped areas are straight lines, but may appear otherwise.
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 Which square is bigger?
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