A sponge, brush or water pistol and some water—that’s all it takes to conjure up Water Light Graffiti on a wall studded with thousands of water-sensitive LEDs. The principle is simple; the results are a feast for the eyes.

Water Makes Light

The water produces an electrical bridge that enables current to flow between the LEDs mounted in a wall panel. The quantity of water also determines how intensively the respective LEDs light up—the more liquid that comes into play, the brighter the rapidly blinking graffito is illuminated.

Read more about this on our Ars Electronica Blog!