"I don't want to be an artist, I want to be a worker." So said Jean Prouvé, who might be surprised that, after a career dedicated to industrial production and the manufacture of functional furniture and buildings, his work has ended up in fine art auctions and displayed in chi-chi gallery windows from Paris to New York. Now on show at London's Design Museum, his furniture, houses and architectural components remain resolutely industrial, sparse and functional, yet beautiful.