Norman Foster, the British architect and winner of Pritzker Architecture Award, describes sustainable design as an approach "doing the most with the least means" and "following the logic of less is more."

He says that "responsible sustainable design is not simply about individual buildings; it should be implemented at all scales — from product design to the design of cities."

This social concern with sustainability that propels architectural design is at the heart of an exhibition currently running at the Tsinghua University Art Museum in Beijing through Oct 7.