Readying for the RoboCup championship in Sweden, Jörg Wilberg (rear left) and his research team at the German National Research Center (GMD) outside Bonn, Germany review the prospects of their five-machine robot-soccer squad. The GMD team plays in the medium-sized division, which uses a real soccer ball on a field about a third as big as a basketball court. Each robot monitors the position of the ball with a video camera; special software lets the machine track its round shape. Kneeling on the floor, researcher Peter Schöll tests the software by observing the image of the ball in the monitor. From the book Robo sapiens: Evolution of a New Species, page 215