It sounds really over the top to say you're responsible for the city of New York, but I do feel responsibility to the city of New York, to this country, to people everywhere. So many people were affected by the events of September 11, and I feel this is one of the ways that that event will be understood and defined.
When I started this project, I was a young architect. I was very apprehensive about any changes to the design. Whether I wanted to or not, I learned that you can accept some changes to its form without compromising its intent. But it's a leap of faith that I didn't want to make initially - to put it mildly.