Pong game played with a laser-tracking system

A colleague sent me this wallpong project (by Adrian Wong and Bhavin Rokad from Cornell University) this morning. It's a pong game played with a lase-tracking system:

"The Wall of Pong brings the arcade PONG game to the real world by projecting an image of the pong ball on any flat surface and allowing players to play the game with real paddles. The game also targets all three of our personal objectives for our ECE 476 final project: an interactive electromechanical system with fast operation. We wanted a project that involved interaction between the user and the system with very fast response times to user's actions to give a satisfying experience. We also wanted to stress a project with electromechanical components, as we wanted something tangible with our project instead of a project based entirely in software."

Why do I blog this? yet another good example to explain the fusing of the physical and the digital.