“My philosophy is that you are quickest on foot. This may sound contradictory. When you walk you move slowly through spaces and by so doing you see more. I have been doing this for 40 years. I move very slowly and gently, I try not to invade other people’s spaces, while at the same time trying to take images. It is a sort of dance, a negotiation, meandering — a very sensitive way of moving through all kinds of spaces.”