To quote out of context is the essence of the photographer's craft. His central problem is a simple one: what shall he include, what shall he reject? The line of decision between in and out is the picture's edge. While the draughtsman starts with the middle of the sheet, the photographer starts with the frame.- John Szarkowski's words to open the chapter titled "The Frame" in "The Photographer's Eye."
The photograph's edge defines content.
It isolates unexpected juxtapositions. By surrounding two facts, it creates a relationship.
The edge of the photograph dissects familiar forms, and shows their unfamiliar fragment.
It creates the shapes that surround objects.
The photographer edits the meanings and patterns of the world through an imaginary frame. This frame is the beginning of his picture's geometry. It is to the photograph as the cushion is to the billiard table.
(This was the catalog for an exhibition at the MoMA in 1964.)