A method for warning a person in a working area about at least one first robot, and a robot system that includes the at least one first robot, wherein the movement of the robot in a future working interval is predicted, a determination is made as to whether a working area segment will be passed over by the robot in a first or second time period, a first or second visual warning is emitted in accordance with when the working area segment will be passed over, and the first or second visual warnings are respectively emitted onto a floor segment that is assigned to a respective working area segment.