Originally posted on GJ Project:
Antonin Fourneau and Digitalarti Artlab spent weeks working together in Paris, France on this Water Light Graffiti project. The project saw the assembly of a large board of LED lights embedded into a water-sensitive light panel. When water, a wet hand, a wet paintbrush or water from a water gun touches the LED panel, the lights instantly brighten. This video is from when the project was taken to Poitiers, France and the public started to interact and get creative with the panel. via
Check out many many more pictures of the project on their Facebook page here.