20 robots fly in a coordinated manner or coordinate. General Robotics, Automation, Sensing and Perception Laboratory (Grasp) of the University of Pennsylvania. The swarm behavior is covered by the Reynolds-Algorithm which was used in movies like "Batman Returns". The algorithm assures that individual swarm member stay in fixed distance to each other and in the same direction. You can experiment with the algorithm Try it out (program by Guilherme Polo).