There's something arbitrary about taking a picture. So I can stand at the edge of a highway and take one step forward and it can be a natural landscape untouched by man and I can take one step back and include a guardrail and change the meaning of the picture radically... I can take a picture of a person at one moment and make them look contemplative and photograph them two seconds later and make them look frivolous.

I think I misunderstood Instagram and just thought it was people photographing their friends, and discovered there were a number of people, a number of artists, who were taking it very seriously and doing very imaginative work with Instagram as the medium.

I've been the head of the photography program at Bard College for over 30 years, and I take that as seriously as I do my photography. My time is devoted to that too.

I meet young artists and it becomes clear that with some the main motivation is getting a show in Chelsea. It strikes me that this is very different to the way it was for me, which was that I wanted to understand photography and the world and myself.

Photography is inherently an analytic discipline. Where a painter starts with a blank canvas and builds a picture, a photographer starts with the messiness of the world and selects a picture. A photographer standing before houses and streets and people and trees and artifacts of a culture imposes an order on the scene - simplifies the jumble by giving it structure. He or she imposes this order by choosing a vantage point, choosing a frame, choosing a moment of exposure, and by selecting a plane of focus.

This idea of imposing an order is very interesting to me. Photography is in essence an analytic medium. … In photography, you start with the whole world and every decision you make imposes an order on it. The question is to what extent it’s an idealized order I’m imposing or is it an order that grows out of what the world looks like.

I do what feels natural, but I can't say I haven't thought about it.