Fade transforms any surface into a “glow in the dark” screen. Just coat the wall with a special transparent spray paint. Wait till dark and install your laser to projector nearby. The laser draws with light and leaves an eye-catching fading trail behind. Why not try long exposure photography for an image that won’t fade.
Instructions on http://streettoolbox.com/wiki/Fade
Tags: arduino, laser, projector, glow in the dark, phosphorescent, 405nm, processing, diy, activism, streettoolbox. tool