We prefer synthetic rather than natural materials. Natural products are almost too valuable. Wood is much harder to produce than metal. And metal is recyclable, while wood isn't.

A building is hard to judge. It takes many years to find out whether it works. It's not as simple as asking the people in the office whether they like it.

The architecture profession has lost a lot of its integrity, especially in the USA. The general architect here has no scruples, no ambitions.

I find if my body feels well and I exercise regularly, I think better, work better and feel better.

You'd never think of taking a cab if you had to walk a mile down Chicago's Michigan Avenue. But in a bad city you take a cab just to go around the corner.

Most architects say: I want to use this type of glass, even if it's too reflective or doesn't let enough light in. However, the use of a certain type of glass might change the comfort level.

Critics are entitled to have an opinion, but how can they judge how comfortable a building is? No critic is smart enough to judge how a building will perform over time.