Someone has just created a pong machine using the same principles as EM pinballs. No computers or video screens. Just physical parts.

http://www.cyberniklas.de/pongmechanik/indexen.html

Very interesting for the techies in the MAACA audience.

If you want to undestand how it works, check out the "industrially" funny video explaining the mechanics at : http://www.cyberniklas.de/pongmechanik/video.html

very very very cool.