Quartz Composer is a Mac Application for visual programming. The program allows anyone to create interactive scripts which can be exported as a Quicktime movie or used as a screen saver. It allows for just about any input–mouse, audio, keyboard–although some some of these won’t work when run in some contexts. To make my critique brief: Quartz Composer is quite fast and powerful and the interface is very usable. Anyone with or without any programming knowledge could create something that looks nice if they play around with it long enough. Ultimately, however, it is very limited. Even if it may seem at first like it could do anything, if you are a creative soul you will find you can only realize your visions if they happen to be doable with one of the prefabricated filters or effects.