How a single piece of furniture ties nations together.
What's the world's most famous chair? An anonymous, cheap, lightweight, waterproof, stackable plastic patio chair, manufactured from just one piece of polypropylene in a single process. The "selene" chair by Italian designer Vico Magistretti, first produced in 1969, broke new ground and is now found the world over, along with a multitude of copies. (All pictures: Keystone)