Observers from afar may mistake these 49 flying objects as UFOs, but they’re actually just “quadrocopters, tiny four bladed flying machines, flying in a ‘swarm’.” Even more surprising, “organizers were able to to program them to move as a single unit, creating 3D shapes and moving in perfect unison to create shapes. The complex control software even meant the four bladed copters, which cost around £800 each, were unaffected by wind.” Continue reading for a video and more information.

The astonishing demonstration was the centrepiece of the voestalpine Klangwolke, a German art and technology festival which took place on September 1st. It drew a crowd of 90.000 people to the Donaupark in Linz, where the quadcopters flew above the Danube as part of a ‘sound cloud’ installation, organised by Brucknerhaus and Ars Electronica. ‘The beginning of this story highlight the discovery of electricity and the subsequent triumph of artificial light,’ the organisers say.