Select two robots and one mechanic. Place the robots in different corners of the room facing different ways. When you give the signal the robots start to walk. They can only walk straight and if there is an obstacle in front of them - they must hit it and continue walking (the robots should be carefull not to hurt themselves). The mechanic can give robots commands: "turn left" and "turn right". The robots must obey the commands. The task of the mechanic is to make the robots meet.
