I saw something very similar to this a few years ago at the DeCordova museum in Lincoln, MA. It may have been this thing, but I'm not sure. It was a floor that you walked on, and could wipe clean with a sweep of your arm, and then start making new blobs. It actually looked like interactive Xscreensaver (interference) on the floor.
I was wrong, it was this thing, and it looks a lot less like Interference now that I see it again.
I used to have a mouse pad that worked like these floors/tables do, and that was the inspiration for the "goop" saver.
I've just been looking at the artist's page, apparently he made them up to 9'x12'. It was basically a projector and the floor, and went by the shadow of where you were standing, not the actual contact with the floor, that's what made it cool to me. 9x12 is about the size of my kitchen, and now I really want this thing in there.
I had the same heat sensitive mousepad, and I thought it was inspired by screensavers. Guess not.
The mouse pad I had wasn't heat, it was 2 layers of clear plastic with different colored liquid on each layer.
All I need is to walk into my living room and freak the fuck out thinking my floor has crashed with a kernel panic.
More fun from Italy: http://www.naturalinteraction.org/