Amazing Mosaic Screensaver For Mac OSX

I remember first seeing a mosaic picture I think it was back in the time of the movie 'The Truman Show'. You know the one where the main picture is actually made up of heaps of smaller pictures, whose colours shape the outlines of the main picture.
Text / Scnshot version at http://www.it-painkillers.com/content/amazing-mosaic-screensaver-mac