Denis Smith is a photographer who makes light graffiti -- time lapse photography that allows artists to insert lights into spaces so that they appear to be free-floating. Smith has created a set of images depicting the travels of a ball of light through a darkened world.
http://www.denissmith.com.au/Portfolio/Pages/Ball_of_Light.html via DudeCraft
@Kalel - Ummmm I donno how to tell you this but that is not up to your usual excellent comments.
(pretty lame if you ask me which you didn't)