 The meaning of Venice, Cambridge or Isphahan is the same for all; it flows from the experience of the spaces and the life that goes on in them.For a long time, we have assumed that cities cannot be built without creating problems, that they can no longer satisfy us in terms of humanity, economics, aesthetics or culture in the way they once did.And yet we shall build them because our cities are still expanding and those of the developing world will grow enormously for decades.