More geekumentaries from Siggraph 2006. Three interactive water displays: a musical harp with water "strings", a liquid touchscreen and a tantalizing fountain that withdraws when a hand comes near. You find some more details from the official Siggraph 2006 site here. Credits to Paul Dietz, Jefferson Y. Han, John Barnwell, Jonathan Westhues and William Yerazunis.
Link to video on Google.