Chladni Plates

While on the topic of oscillations and cool wave behavior, check out the following vid of a Chladni Plate in action. Think you can come up with the wave function that describes this bad boy?

To make this, all you need is a somewhat think metal plate, some sand or salt (really any finely grained material will work) and finally a violin thingy (the tool you use to set the violin strings into oscillation)

The sand basically falls into the contours as the metal plate is deformed from the oscillations.