Nevermind. http://en.wikipedia.org/wiki/Heliodisplay http://en.wikipedia.org/wiki/Heliodisplay explains it. The projection surface is actually a very fine ist

Nevermind. http://en.wikipedia.org/wiki/Heliodisplay http://en.wikipedia.org/wiki/Heliodisplay explains it. The projection surface is actually a very fine ist being sprayed. That makes perfect sense, the original website doesn't mention anything about water.