Magnetic fluid responds to music

This Ferrofluid is a magnetic fluid. On these towers (one of the features at wired’s NEXTFEST 2007) the ferrofluid actually reacts to sound. Soon you will be able to buy these. The white background is actually fluid in a well that has a light shining on it. It seems white because the fluid is incredibly reflective. The bad thing is that they take up a small table and you cant touch them or put metal near them.