The back of Saint Peter's is one of the finest pieces of architecture I've ever seen.

My buildings are all on budget.

You have freedom, so you have to make choices - and at the point when I make a choice, the building starts to look like a Frank Gehry building. It's a signature.

I attended a lecture by a gray-haired old man from Finland, who later I discovered was the architect Alvar Aalto. I was very moved. I wasn't interested in architecture, but it was a moving thing I've never forgotten.

For me, every day is a new thing. I approach each project with a new insecurity, almost like the first project I ever did. And I get the sweats. I go in and start working, I'm not sure where I'm going. If I knew where I was going I wouldn't do it.

Some cultures tried to stop people from expressing themselves. In Mao's China, for example, the Communists tried to stop individual expression. For them the payoff was a society of equality. The problem of course is that it didn't work.

The back of Saint Peter's is one of the finest pieces of architecture I've ever seen.