That’s been one of my mantras — focus and simplicity. Simple can be harder than complex; you have to work hard to get your thinking clean to make it simple.

Buildings, towns and cities are the most powerful and moving elements of our existence, as powerful as religion, music, art or politics. Yet cities are, and always have been, more than these: they are permanent, public and shared in both expression and achievement. Architecture and urbanism, I have no doubt, are our greatest achievements.