In April 2010, five student teams at Heilbronn University were set a tricky task: they had to play “football” and score a goal with a squash ball and a goal that was reduced to a tenth of the normal size. Each “football team” consisted of just one specially constructed player who had to be both defender and striker – a dual function that requires special skill. Andreas Paul, a student intern at KACO, and his partner Jochen Schuhkraft solved the problem using the spring from a bicycle luggage rack. This made it possible for the 20 centimetre figure to score goals. The defence relied on shifting the centre of gravity. The design helped the team to victory in this remarkable football tournament, netting them 500 euros in prize money.