Um, great link to the web site with the spinning ball and everything, but it doesn't exactly prove anything about an curve balls.
Curve balls actually move. It is not an illusion. There is no debate about it.
If you don't believe me, you can check out any of the data from the PITCHf/x systems at every major league ball park that instantly tell you the speed, trajectory and movement of every pitch thrown for every major league game.
here's a link to a Wall Street Journal article about the same:
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Yg Bluig of MA 5:27PM October 31, 2009
Web Design Chennai 5:39AM October 31, 2009