With the eye of the machine, Stieglitz ... has shown that the portrait of an individual is really the sum of a hundred or more photographs. He has looked with three eyes and has been able to hold, by purely photographic means, space-filling, tonality and tactility, line and form, that moment when the forces at work in a human being become most intensely physical and objective. In thus revealing the spirit of the individual he has documented the world of that individual, which is today.