"Quartet" by Jeff Lieberman and Dan Paluska. Installed at the Ars Electronica Center, this piece - which won an award of distinction from Ars in 2008 - includes a set of robotically controlled tuned wine glasses and a 42-key "ballistic marimba". You get to play it, more or less, by entering a theme at quartet.cc and letting the computers and robots in Linz perform and send you a video.