absence and presence

The true content of a photograph is invisible, for it derives from a play, not with form, but with time. One might argue that photography is as close to music as to painting. I have said that a photograph bears witness to a human choice being exercised. This choice is not between photographing x and y: but between photographing at x moment or at y moment. The objects recorded in any photograph (from the most effective to the most commonplace) carry approximately the same weight, the same conviction. What varies is the intensity with which we are made aware of the poles of absence and presence. Between these two poles photography finds its proper meaning. (The most popular use of the photograph is as a memento of the absent.)

-- John Berger The Look of Things