Thinking big allows innovators to start with a clean sheet of paper and consider a full range of design approaches and possible futures.

FORBES: Part Four of a Six-Part Series

Paper or not, Boeing is milking the image of the futuristic delta-wing design with huge posters on, for instance, the road from central London to Heathrow airport.

ECONOMIST: Boeing v Airbus

The design is first sketched on paper, and then engraved on stone, in reverse, with a knife.

UNESCO: Culture