On certain projects, on big public projects, people definitely are interested in making them greener, but on smaller projects with tight budgets it can be harder.

One of my unsung heroes is Erich Mendelsohn. I met him when I was a student and he was a cranky old man and very unpleasant. But if you go to his Einstein Tower in Potsdam, Germany you see an enormous intellect at work with a language that was personal and new. It has a sense of urban design and of theater and procession I hadn't seen before.

I'm a do-gooder liberal.

A well-designed home has to be very comfortable. I can't stand the aesthetes, the minimal thing. I can't live that way. My home has to be filled with stuff - mostly paintings, sculpture, my fish lamps, cardboard furniture, lots of books.

That's where you have to look for your inspiration. Don't separate the rest of your life - who you are, what you love - from your work.

You have to do every detail on every bloody piece of the building. You have to know how the engineering works. You have to know how the fittings go together. You have to master the mechanical, electrical, acoustical - everything.

My buildings are all on budget.