I was there too! It started back at our old Kinect hacking meetups :) I remember when these guys started meeting each other. Essentially, it is a display in a v

I was there too! It started back at our old Kinect hacking meetups :) I remember when these guys started meeting each other. Essentially, it is a display in a vacuum moving up and down really fast. I remember them talking about using either a display, or a solid color and a pico projector. Not sure which they actually went with.