Zogotunga - Stay hungry, stay foolish
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The Illusion of Sex Change

"These two faces are perceived as male and female. However, rest assured that the both faces are actually versions of the same androgynous face (neither male, nor female). One face was created by increasing the contrast of the androgynous face, while the other face was created by decreasing the contrast. The face with more contrast is perceived as female, while the face with less contrast is perceived as male. The Illusion of Sex Change demonstrates that contrast is an important cue for perceiving the sex of a face, with greater contrast appearing feminine, and lesser contrast appearing masculine."

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Floating stain

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Shady Optical Illusion

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Shady Optical Illusion

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Reversal

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Optical illusion

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Year's Best Optical Illusion

"No, you have not had one grappa too many. These images of the Leaning Tower are actually identical, but the tower on the right looks more lopsided because the human visual system treats the two images as one scene. Our brains have learned that two tall objects in our view will usually rise at the same angle but converge toward the top—think of standing at the base of neighboring skyscrapers. Because these towers are parallel, they do not converge, so the visual system thinks they must be rising at different angles, as demonstrated by this year's winner of the Best Visual Illusion of the Year Contest, sponsored by the Neural Correlate Society."

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