Mumford -- Art and Technics (xiv)

"As with printing, photography did not altogether do away with the possibilities of human choice; but to justify their productions as art there was some tendency on the part of the early photographers, once they had overcome the technical difficulties of the process, to attempt to ape, by means of the camera, the special forms and symbols that had been handed down traditionally by painting. Accordingly, in the nineties, American photographs became soft and misty and impressionistic, just when impressionism was attempting to dissolve form into atmosphere and light. But the real triumphs of photography depended upon the photographer's respect for his medium, his interest in the object before him, and his ability to single out of the thousands of images that pass before his eye, affected by the time of day, the quality of light, movement, the sensitivity of his plates or film, the contours of his lens, precisely that moment when these factors were in conjunction with his own purpose. At that final moment of choice--which sometimes occurred at the point when a picture was taken, sometimes only after taking and developing a hundred indifferent prints--the human person again became operative; and at that moment, but only at that moment, the machine product becomes a veritable work of art, because it reflects the human spirit." (93)