Follow the instructions.
Get ready to experience an hallucination.
1.- Click on the link below
2.- Then "click me to get trippy",
3.- Look at the center of the screen for 30 seconds, and then.
4.- Look at your hand holding the mouse, without moving it away from the mouse...
NOT BEFORE!
( it is called "cenesthetic hallucination")
http://www.neave.com/strobe/