It’s Friday night and these guys are driving around town looking for a good spot to play a head-to-head game of Snake. It’s not that they need somewhere to sit (they travel with a couch and floor lamp for that purpose) it’s that they’re using a projector and camera to make a game out of their surroundings.
A white Mystery-Machine-style van has room for everything they need to make the traveling arcade happen. A mobile power supply provides juice to the camera and projector. To get started, the system takes a high-contrast black and white photo of the surface in front of it. Everything that appears below the white threshold becomes a wall on the game board, everything else is a playable area. Obstacles are formed by windows, doorways, pipes, signs, pieces of foam board the guys hang on a wall, and even your body if you stand in the way during scanning. From there the guys each grab a joystick and play the hacker-favorite game of snake.
After the break you can watch a description of how the system works.