Stare at the four black dots in the center of the picture for about 30 – 60 seconds. Then quickly close your eyes and look at something bright (like a lamp). You should see a white circle with an image inside it.

Stare at the four black dots in the center of the picture for about 30 – 60 seconds. Then quickly close your eyes and look at something bright (like a lamp). You should see a white circle with an image inside it.
