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The Amazing Dots

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P.J.

P.J.

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Watch the X in the middle very closely.

You should start to see a green dot that rotates around the circle - this dot is an illusion; then you should see see the purple dots disappear.... but they haven't really gone. It is an after image effect, sometimes called a 'negative retinal afterimage' - move your head slightly, and the dots will reappear... amazing or what?



Grand Illusions - Optical Illusions - Amazing Dots
 

Not only the + in the middle P J Sir! When we stare at any point on this page, the green dots seem to rotate!

The same principle of 'negative retinal afterimage' is the reason for the negative picture of the lady appear positive!

Negative of a negative is positive!! :cool:
 
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