We’ve seen the zippy quadrotors of UPenn’s GRASP lab build structures autonomously. Now watch them take cues from a leader and fly as a unit. 50% of the time, the drones hover within 2 centimeters of their correct position.
https://gizmodo.com/watch-a-swarm-of-flying-robotic-drones-construct-a-tiny-5734564
[Via IEEE]