Hence the detail which interests me is not, or at least is not strictly intentional, and probably must not be so; it occurs in the field of the photographed thing like a supplement that is at once inevitable and delightful; it does not necessarily attest to the photographer's art; it says only that the photographer was there, or else, still more simply, that he could not (i)not(i) photograph the partial object at the same time as the total object (how could Kerész have 'separated' the dirt road from the violinist walking on it?). The Photographer's 'second sight' does not consist in 'seeing' but in being there. And above all, imitating Orpheus, he must not turn back to look at what he is leading — what hi is giving to me!
Roland Barthes, Camera Lucida: Reflections on Photography
47, looking, photography