It is abstract non-narrative art. The screensaver format is simply ideal for such things. It is quiet and un-obtrusive whilst providing a gentle textured backdrop. But on closer examination it generates exquisite and endlessly varying patterns. It is truly beautiful. This screensaver has a very long history in its development and the first realisation of the visuals goes back to about 1983 when the algorithms were developed. Follow the link and free download GridCity now.