I know i know - screensavers are not needed to protect monitors anymore, and it is stupid to even spend money on them, especially as much as this one should cost, and it seems to be around since a bit longer, too. I haven't bought it and will not (far too expensive for just a screensaver), but I just tested it in trial mode, which means for two minutes it runs by normally itself (manually started) before it get'S disturbed by an ugly screen reminding you to buy a register code.
But this thing is very very beautiful.
http://www.3planesoft.com/pages/watch.html
see yourself, you can safely download and install it, and deinstall it via software menu again (I did). It looks absolutely fascinating and is a masterpiece of beauty, really. It can be manually started, too (not only via the screensaver function).
Watch, enjoy, relax!