Unlike the fine-art objects of pre-democratic eras, photographs don’t seem deeply beholden to the intentions of an artist. Rather, they owe their existence to a loose cooperation (quasi-magical, quasi-accidental) between photographer and subject—mediated by an ever simpler and more automated machine, which is tireless, and which even when capricious can produce a result that is interesting and never entirely wrong.

— Susan Sontag, On Photography, 1977