The picture-story involves a joint operation of the brain, the eye and the heart. The objective of this joint operation is to depict the content of some event which is in the process of unfolding, and to communicate impressions. Sometimes a single event can be so rich in itself and its facets that it is necessary to move all around it in your search for the solution to the problems it poses — for the world is movement, and you cannot be stationary in your attitude toward something that is moving. Sometimes you light upon the picture in seconds; it might also require hours or days. But there is no standard plan, no pattern from which to work.

The Decisive Moment (1952), p. i; also in The Mind's Eye (1999)