This water activated LED light installation was created by Antonin Fourneau, and it looks like it would be fun to mess around with on a hot summer 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 a brightness message or just to draw."
--via Cheezburger
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Not pretentious or gross.
Just inventive.
Big Google is watching you.
http://www.time.com/time/business/article/0,8599,1631957,00.html