iPhone-controlled 3D display, via ping pong balls and air pumps

I'm not quite 100% sure what this is -- it's supposed to be a "floating forecaster," some sort of 3D display for weather information, but to me it looks more like 30 air guns with ping pong balls sitting in them. I don't really see how the "weather" part of the display works, but what's really cool is that the whole thing is controlled by an iPhone. It looks like you touch whichever part of the grid you want to raise or lower, and then move your thumb up or down to set the ball at a certain level.

With a little more software work, there's probably a lot more that could be done here, just creating patterns by swiping across the screen, or even running a game like Pong as the balls raise and lower across the grid in sequence. But as an art installation, it's pretty neat as is. Check out the full video after the break.

Thanks, William!