Recently posted on Dezeen.
The experiment was conducted by Swiss architects Gramazio & Kohler and Raffaello D’Andrea. It imagines if our cities were built by fleets of flying robots. A group of robot helicopters were programmed to lift and stack 1500 polystyrene bricks into a six metre-high tower at the FRAC Centre in Orléans, France
Flight Assembled Architecture by Gramazio & Kohler and Raffaello d’Andrea