Last month recent RCA Graduate Harry Thaler presented a pressed aluminum chair which you can hang on your wall (not really something I would suggest, but it demonstrates the character of the design) or just bent and sit on it.
The aluminum is 2,5 mm ‘thick’ and is strong enough to allow you to sit on it. The material is remarkable for its ability to resist corrosion and is extremely light. Another idea of a one piece chair with own values. Oh, and did I mention that it’s also stackable? I wonder how fat you have to be to not be able to sit on it.. I should ask Harry.