I make a model of the site. There are some obvious things: where the entrance should be, where the cars have to go in. You start to get the scale of it. You understand the client's needs, and what the client is hoping for and yearning for.

Anybody I talk to agrees that maybe 2 percent of the building environment since the war, we could call architecture.

Just because you are an architect and make decent buildings does not mean that you can suddenly become a set designer for one of the best avant-garde dancers in the world.

China is building cities for a 20 to 40 percent increase in population. India is quickly growing. The carbon footprints of that and other development around the world are overwhelming.

There is a backlash against me and everyone who has done buildings that have movement and feeling.

Everything - design and technology and materials - has changed since the World Trade Center was built. A lot of it has to do with computers, which allow us to be far more efficient as well as structurally sound.

The best advice I've received is to be yourself. The best artists do that.