What is the best screensaver that you have used or seen?

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In ur opinion, whats the best screensaver out there. The one which you admires the most and may sit in front of your monitor for hours just watching and comtemplating it... For me, this one is one of the best. The fishes are so well done and designed that you may think you are sitting in front of a real aquarium. http://www.allume.com/win/aquazone/index.html This one is for me. Whats yours? Share with us.