iLLUSIONS
If you stare at one yellow dot for a while, the other yellow dots disappear.
Stare at the four black dots in the center of the image for 30 - 60 seconds. Then quickly close your eyes and look at something bright (like a lamp or a window with sunlight coming through it). You should see a white circle with an image inside it.
Stare at the dot in the center of the circle and then move your head closer to it. Neat!
This is one of classic optical illusions - it is called dancing elephant. Try to count the number of his legs (by Roger Shepard).
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