MAKE calls it an XY table, and I can sort of work out what that means. It's like a giant Etch-A-Sketch, but it doesn't sketch or etch. It just kind of moves around on a… is that a skateboard? And why does the contraption sound like the beginning of that one Air song off of Premieres Symptomes? I must be dreaming. Get it together, man!
Okay, I've just checked and I'm not dreaming. It's the world that's gone mad. It really is a huge mouse-controlled Etch-A-Sketch suspended in the air in someone's garage.