Celestial City, completed in 1997, is one of a series of silent computer video works composed by me between the 1980's and early 2000's, collectively titled "Spells from the Book of Lights." As with most of the other works in this series, it was programmed "from scratch" in the C language and designed as an “emergent” dynamic display, based on an unseen background process controlled by a multiplex algorhythm. Celestial City is intended to have a somewhat different look each time it is run, and to cycle continuously with no repeats. The present version is a 7 minute excerpt from a single "run" of this work. NB: Celestial City should display smoothly and continuously at a fairly rapid pace, but might progress more slowly and/or less continuously on some systems, so please be patient. If you don't see anything at first, or if the display stops, click on the "Pause" symbol at the lower left, and then on the "Play" arrow, and it should start up again.