be present on the sports field such sensors may for example comprise cameras for recording images in visible uv or infrared spectrum laser scanners touch sensors ultrasound or radar scanners and a more or less well developed signal processing unit for analyzing sensor input microphones and associated speech recognition module is also an option such that random people in the robot 39 s proximity can bring it to stop simply by shouting at it if any unforeseen situation should occur online connection to a human operator via for example a telephone connection could also be established for example in case of unusual sensory input which it requires human capability to interpret the operator can for example have an overview of a large number of robots since he is only supposed to intervene relatively infrequently and he does not need to be near the playing field but can sit anywhere as long as he is so close to the planet that the time delay due of the signal transmission over long distances does not become excessive fig2 shows a robot unit 2 in schematic depiction the unit 2 includes a reservoir 3 for paint 12 where the reservoir 3 includes portions 4 of the bag in box type which are connected a joint pump 4 via a quick connection 6 and connection pipe 7 in the shown example according to fig2 there is placed two bag in box cartons 5 on the robot unit 2 but more portions of paint can be placed on a robot unit for instance stacked in layers or side by side as.