German sociologist Franz Carl Müller-Lyer (1857-1916) created an optical illusion that showed how changing the direction of angle brackets on line segments can make the segments look longer or shorter than they actually are. Artist Gianni A. Sarcone made a animated versions of the illusion and the effect is even more pronounced.
Cool animated examples of the Muller-Lyer illusion
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- optical illusions
The trick that makes spot-the-difference puzzles ridiculously easy
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Phew! Creepy alien on a recent flight turns out to be an optical illusion
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This tiny phone is worth the hype
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