Airhockey in two parts

For this demo at Cebit, they had set up an air hockey table... well two halves of one anyway, the two parts were actually across the room from each other. On the wall in front of each one was the projection of the other half. When one person hit the puck it would be shot out at the same place on the other side, yes they actually used pucks not just an image. Pretty cool idea, imagine if you could set up something like this to run over the internet... you could play airhockey against your friends around the world... maybe they'll upgrade to ping pong next or even cooler maybe some foosball.