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Slippery Slope Optical Illusion

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In this optical illusion, are the horizontal lines parallel or do they bend?
Optical Illusions - Slippery Slope

Optical Illusions - Slippery Slope

How it works: By laying the alternation light and dark squares into staggered rows, our horizontal perception is tricked into thinking that the lines are bent. For the illusion to work, each square must be outlined with a color somewhere between the dark and light colour of the squares.

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