Optical Illusion?

Steve's email called this a "cenesthetic hallucination". I don't think that is quite right, but I am not sure what you would call it. It is definitely very odd, and not for anyone subject to epilepsy.

Directions (the ones on the linked page a little hard to read):

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...

http://www.neave.com/strobe/