Compare these drones to the UFO swarm from my previous post, or just enjoy the light show. I see other videos by this same outfit, so I might post a couple more in a few.
From the Youtube description: Quadrocopters turn into pixels at the voestalpine Klangwolke and form 3D-Modells in the sky. As a world-premiere, the Ars Electronica Futurelab has managed to fly a formation outdoor with so many quadrocopters, painting some moments of magic into the nightsky of Linz. For further information, please visit: http://www.aec.at/spaxels/
Title: 49 quadrocopter in outdoor-formation-flight / Ars Electronica Futurelab / Linz, Austria (YT link) Uploaded by ARS Electronica.