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Shadow: cross view 3D
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Wings
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Up and away
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Magic egg
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Window seat
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Big size
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Child and paint 1
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Child and paint 2
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Child and paint 3
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Child and paint 4
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Frowning
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Dark horizon illusion
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Dark horizon illusion
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Dark horizon illusion
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The wall is bent outwards
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Mobile phone wallpapers
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Altocumulus deck
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Great circle shadow
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Gravitational anomaly?
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Ambiguity: humps of hollows?
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Island mirages: congestus with a flat bottom and a hint of pileus
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Reflection and refraction
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Mobile phone wallpapers
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3D illusion
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Proximity illusion
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Intruder!
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Image in a drop (see description)
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Sky intensity map
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Ambiguous figure
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Ambiguous figure