Water Light Graffiti is an installation by Antonin Fourneau that lets you use water and light as your painting medium.
The "Water Light Graffiti" is a surface made of thousands of LED illuminated by the contact of water. You can use a paintbrush, a water atomizer, your fingers or anything damp to sketch a brightness message or just to draw. Water Light Graffiti is a wall for ephemeral messages in the urban space without deterioration. A wall to communicate and share magically in the city.
Pretty awesome how the wall illuminates when a couple of buckets of water are thrown at it.