Here's a flash based gallery showing a novel application of the time-slice photography/film techniques that tim macmillan invented and reinvents in this new context.

The images are created by having the graffiti created with torches over a long exposure - 5-10 seconds, at a guess - in darkness, or near darkness and then using a second curtain flash to capture the graffitist frozen and clear. The effect is very beautiful and mesmerising but I wonder something more substantial could be built with it.

(thanks to aesop for the link)