Norman Foster: I think it’s working with those who commission a building to perhaps try to persuade them that it can go beyond their expectations. If I take the Reichstag — which was mentioned in passing this afternoon in the introduction — the idea that the populace could ascend through a spiral ramp to an observation platform, could occupy the roof, could have the experience of a coffee or a meal on the roof of Parliament, and could look down on the politicians below. And that this building could be a manifesto for green energy, with no fossil fuels, no pollution, zero carbon virtually. All of that was born out of convincing those politicians that this was possible. This was never part of what they asked for. But they were, in a way, encouraged, and bought into that expanded vision of the project.