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This illusion is caused by the location of color receptors and black and white receptors on your retina. One set of receptors is located near the center of your retina while the other is located along the circumference. By focusing on the cross in the middle the light from the colored dots is hitting where your retina is mostly sensitive to black and white images. I'm not sure but I think the green dot persists because of the movement.
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Jack1.0
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I've learned to embrace my inner Geek.
I haven't found anything else I'm good at.
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