Defined by its creators as a "collaborative art project" Zoomquilt is one of the most spectacular collaborative art creations I have ever seen. Technically, the Zoomquilt project is a recursive set of pictures conceptualized and produced by Nikolaus Baumgarten as an online presentation.
Similarly to the commonly known effect created by two mirrors placed one in front of the other, the special technique is used by the Zoomquilt artists to create a very long zoom in motion allowing the viewer to control speed and forward-backward directions. The project is available in Flash, HTML and Screensaver (exe) formats. I recommend you'd take the Flash.