Check out this video from TED of Raffaello D’Andrea, a well known autonomous systems expert who develops autonomous and synchronised flying machines, demonstrating the newest of their technologies.
Raffaello D’Andrea and his team famously assembled a tower in front of a live audience at the FRAC Centre Orleans in France which took 3 months to build. The installation consists of 1,500 modules put into place by a multitude of quadcopters and is now a permanent collection of the FRAC Centre.
Both videos are below: