It’s a development that could have been born at this year’s inaugural FOS Future Lab, where flying vehicles and autonomous racing cars were revealed, alongside the world’s most advanced 3D printer. But instead, this is the work of Milan-based Professor Carlo Ratti, whose system is called Paint By Drone and puts to work a fleet of unmanned aerial vehicles (UAVs, or drones to you and me), each with its own tank of paint. They all paint with CMYK colours (cyan, magenta, yellow, key/black), replicating traditional printing set-ups. The artistic process is – somewhat inevitably – controlled by an app, which co-ordinates each drone and can recreate any piece of art that has been programmed into it. Alternatively you can draw on the app, and watch as the drones bring to life your brush strokes in real time.