Hering's Optical Illusions | Ehrenstein's Optical Illusions | Meyer's Optical Illusions | Zöllner's Optical Illusions | Müller-Lyer's Optical Illusions | Poggendorf's Optical Illusions
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The slanted lines cause the illusion that the blue lines are not parallel. In fact they are!
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The circles make the blue squares seem distorted.
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You probably perceive the middle lines as bowing out slightly. In fact they are parallel!
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Slanted lines make the blue square seem distorted.
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The center shape is in fact a circle.
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Parallel lines intersected by a pattern of short diagonal lines appear to
diverge.
Explanation: the brain is attempting to interpret this image as if it were
part of a three-dimensional scene.
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A variant of Zöllner's optical illusion based on parallel bars. Note that the strength of the illusion depends on the pattern, especially on the slope of the diagonal pattern lines.
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Probably the most famous and most studied illusion was created by German psychiatrist Franz Müller-Lyer in 1889.
Although your eyes tell you that the left horizontal line is longer than the right one, they are equal in length.
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The single line if continued joins with the lower of the pair, not the top.