A pregnant situation is simply an event— like a group of people, a character or a happening— that holds the possibility of a picture. But you must not force the subjects into a picture. The situation must give birth naturally. All the photographer can hope to do is capture the moment when the picture arrives. What I do is this: latch on to a pregnant situation and walk around it shooting pictures, improving on each previous shot by slight shift of viewpoint, moving closer and so on. Occasionally the situation builds up to a natural climax— and that's the birth of a picture! So the contact sheet shows a lot of little bursts, occasionally shooting up to a picture that I will print.