Optical Illusions
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An expanding handkerchief
A handkerchief appears to approach us.
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A shrinking handkerchief
A handkerchief appears to move away from us.
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A spring
It appears as if a spring gushed out.
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Acorn storm
The outermost part of the ring appears to expand while the inner one appears to contract.
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Donguring*
* donguri (acorns)
The outer ring appears to expand and rotate counterclockwise, whereas the inner one appears to contract and rotate clockwise.
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A tire of acorns
The tire of acorns appears to nearly explode.
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A landing UFO
The UFO appears to approach us or rotate.
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Trip eyes
Circles appear to expand. In addition, red radial lines appear to be wavy.
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Meganezaru*
* kind of monkey
Pupils in eyes appear to expand.
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Respiration
Squares appear to expand or contract.
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Looming black holes
The black holes appear to approach us.
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A worm
The worm appears to approach us.
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Advance
The yellow ring appears to advance slowly.
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Swirls
The left swirl appears to contract while the right one seems to expand.
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Two flowers
The right flower appears to expand while the left one appears to contract.
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A flower festival
Each flower sometimes appears to expand.
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Takenoko*
* bamboo shoots
The ring of bamboo shoots appear to expand. In addition, green appears to increase its intensity when observers approach the image fixating at the center, while red does when observers move away from the image fixating at the center.
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Robotics
Straight, vertical edges appear to bend. Moreover, the image appears to expand.
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Flowers
Each flower appears to expand.
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Boiled solution
Some appear to expand while others appear to contract.
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Huygens's principle
The waves appear to proceed.
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Bathroom tiles
The checker pattern appears to expand or contract.
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A black hole
The circle appears to expand gradually.
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Surprise
Each object appears to expand.
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A molecular tube
The image appears to expand.