Remember writing your name in the dark with a sparkler? Take that, add a long urban tradition of street graffiti, mix well with new lighting technologies. Cologne, Germany-based artists Lichtfaktor have made it their main mode of artistic creation. They've gathered a vast set of "paintbrushes" for their new medium--not just sparklers, but fluorescent tubes, LEDs, glow sticks, and plain old flashlights. It's not just for fun, either--they've created a following among the film crowd and major ad agencies alike.Watch the videos and read the full story on Wired.