When assignments were over, photography continued. One of the primary reasons it did was that I wanted and needed to have fresh work. Also, it's very stimulating to be around non-professional photographers. They're the ones with the purest flame burning about their photography. I appreciate that.

I'm interested in smokers standing on ledges, and big box stores, the rise of the suburbs, and the hollowing out of small towns. Self-storage. Things that didn't exist 50 years ago. Our common culture. What we have agreed is OK to live with.

And that desire-the strong desire to take pictures-is important. It borders on a need, based on a habit: the habit of seeing. Whether working or not, photographers are looking, seeing, and thinking about what they see, a habit that is both a pleasure and a problem, for we seldom capture in a single photograph the full expression of what we see and feel. It is the hope that we might express ourselves fully-and the evidence that other photographers have done so-that keep us taking pictures.

My first priority when taking pictures is to achieve clarity. A good documentary photograph transmits the information of the situation with the utmost fidelity; achieving it means understanding the nuances of lighting and composition, and also remembering to keep the lenses clean and the cameras steady.

It's a little bit like talking about the life of writing. The life of writing may be about many things, but it always begins with the writer. With the kernel of an idea, or a character, or an idea or a theme, or even an outcome. But for documentary photographers, photographs begin at that intersection of the real world and the imaginative inner world.

That statement [ Stephen Ambrose:'You, Sam, have the hardest job, which is, pretend like nothing has happened in the last 200 years.'] woke me up to the fact that the landscape that Lewis and Clark came across was greater than the Serengeti. And it's gone.

The longer we lived with it the more we wanted something less about process and more about life.