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Afterimages
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Click here to see the slideshow of illustrations from Eric Carle's children's book, "Hello, Red Fox"
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More Afterimage pictures:
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Look at the lady on the left, staring right at her nose. After about 10 seconds, stare at the nose of the lady on the right. She will probably appear to blush.
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Stare at the red parrot's eye for about 20 seconds. Then, look in the cage. See if you can "trap" the green parrot completely inside the cage.
This is difficult because as you move your eyes to try to look at the green afterimage, the image moves also.
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Stare at the blue dot above. As you continue to stare at it, the blue dot should become smaller, and may completely disappear.
Your brain "remembers" the larger area better than it does the blue, and the blue dot seems to fade away.
A similar illusion is found below:
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