Thanks. This stuff makes my head hurt. :-P
I think I will try to reread this thread tomorrow, and see if I can understand more the second time around. Thanks to all who have been explaining this effect. It sounds quite important.
Heh - it's making me dizzy. I think I feel neurons going into seizure.. =) I'm gonna brew a pot of coffee and then I'll give it a shot. I think I have the explanation (as best I understand it) almost focused in my mind's vision..