In practice a photographer does not concern himself with philosophical issues while working; he makes photographs, working with subject matter that he thinks will make the pictures.
John SzarkowskiPhotography is a system of visual editing. At bottom, it is a matter of surrounding with a frame a portion of one's cone of vision, while standing in the right place at the right time. Like chess, or writing, it is a matter of choosing from among given possibilities, but in the case of photography the number of possibilities is not finite but infinite.
John SzarkowskiPhotography was not invented to serve a clearly understood function. There was in fact widespread uncertainty, even among its inventors, as to what it might be good for.
John Szarkowski