This pretty much speaks for itself. If I am not mistaken our own packet pro Patrik Fältström is visible in the audience at the end of the clip.
Water and Light Controlled Synthesizer (No Soldering Required!)
This was going to be my summer project, but after getting the parts I couldn’t stop myself from putting it together straight away. About a year ago I read an article about a guy who put together a synthesizer controller using laser pointers, a bowl of water, a solar panel and MAX/MSP. I can’t find the link anymore but it doesn’t matter when you want to roll your own!