Residents of Linz, Austria recently saw lights in the sky. 50 of them, actually, as that's the number of quadrotors that took to the air to perform a synchronized light show.
Called "The Cloud in the Web," the show featured 50 AscTec Hummingbird quadrocopters all communicating via radio, programmed by a team formed from Ars Electronica Futurelab and Ascending Technologies GmbH. 50 is apparently the highest number of quadrotors that have synchronized with one another all at once, and it's definitely the highest number we've ever seen.
Check it out in the video below. The little 'copters move around from just looking pretty to creating shapes and the aerial positioning of the swarm is notable in that it doesn't appear to be affected by the wind. Even on a still day, if you go high enough you'll catch a gust, and these 'copters look pretty high to us.
Via Ars Electronica