Bright sunlight floods the Volkswagen Virtual Engineering Lab in Wolfsburg. Two dozen screens flicker, some of them showing graphics and others hundreds of lines of program code. In the centre of the room, there is a 1:4 scale model of a Golf. Frank Ostermann inspects the model, and then he changes its wheels, replaces the rear lights and modifies the wing mirrors. Ostermann uses voice commands and gestures to change the design. It is all completed in a matter of seconds.