Playing with Quartz Compositions in REALbasic
If you run "locate .qtz" in the terminal, you'll see hundreds of Quartz Compositions. Apple is using them a lot in iChat, iMovie, Photo Booth, iDVD and screen savers. So take a look in this folders on your hard disc:
/System/Library/Compositions
/Developer/Library/Quartz Composer/Examples
And don't forget to install Developer Tools to get the Quartz Composer application.