The Floating
White Dot

To make a floating, phantom white dot appear on the right-hand side, look at the black dot on the left for about 20-seconds. Count to yourself, or use the handy timer below.

When the time is up, look directly at the black square on the right. You will soon see an image of a white dot; an afterimage of the black dot.

These affects are not harmful, and may indeed have therapeutic benefits.

You need to use a Java enabled browser to see this applet.
Click on the eyeballs to start Timer.
Listen for a coo-coo clock sound when time is up.