“But he learned also that the factuality of his pictures, no matter how convincing and unarguable, was a different thing than the reality itself. Much of the reality was filtered out in the static little black and white image, and some of it was exhibited with an unnatural clarity, an exaggerated importance. The subject and the picture were not the same thing, although they would afterwards seem so. It was the photographer's problem to see not simply the reality before him but the still invisible picture, and to make his choices in terms of the latter.”
John Szarkowski, The Photographer’s Eye