Developed by a team of researchers from Aalto University in Espoo, Finland, augmented reality system "Augmented Climbing" lets you play the famous video game Pong on a climbing wall. Both players stand on either side of the wall and use their hands or their feet to return the ball whose trajectory is traced using a backlight. The "Augmented Climbing" system works with a tracking software, a high-definition projector and a motion sensor that follows every move of the players on the climbing wall.