Water Light Graffiti
(Vimeo Link)This water activated LED light installation was created by Antonin Fourneau, and... ...er day!The LED are "illuminated by the contact of water . You can use a paintbrush, a water atomizer, your fingers or anything damp to sketch...
https://www.neatorama.com/2012/08/20/Water-Light-Graffiti/
