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Use the q and w keys to control the racket. (click on the applet first)

Imagine a large field, where a group of people running along one side
play a game of pong, as the field is a huge touch screen, where each
person can only touch one pixel.

Referring to Loren Carpenter's 1991 performance and the same
concept explored further by monzy. Read more about the original
technology here.