by Doly » Tue 14 Mar 2006, 11:33:29
Optical illusion. It does seem to go on moving from the point it stopped, but if you actually look at where exactly the hand was pointing when you start looking away, you will realise that it has moved (even though it looked like it didn't).
I guess it has something to do with the brain's ability to fill in the gaps. Our brains give us a picture of a very stable reality, even though our eyes are moving all the time.
FYI, if you do acid your brain seems to lose some of this ability to fill in the gaps... causing the most strange impressions.