First of all, I appropriate photographs.In presenting the Richard Prince photograph I tried to be as neutral as I could be. I put down the fact of it. I wanted it to be the same thing he wanted it to be, an open ended invitation to think about authorship, and who owns a created work. So I pair it with my appropriated picture.

I will just say, appropriation is an intellectual idea until it happens to you. It's a philosophy, and it's got its own intellectual framework. Then there's what happens when it's your photograph. Then it's personal, and that's all I'll say.

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.

For example, in my dorm, at the University of Kentucky, I had the only camera. I don't think anyone came to college with a camera, other than me.

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.

[ My time and our common culture] it's what I'm photographing, and I'm very involved with that.

Though Geographic didn't publish that photo in the story that it was done for, "The Life of Charlie Russell," a cowboy artist in Montana. But later, maybe a year and a half ago, they named it one of the 50 greatest pictures ever made at National Geographic.