It isn't what a picture is of, it is what it is about.
The very best pictures adapt themselves to many changes in meaning.
Photography's central sense of purpose and aesthetic: the precise and lucid description of significant fact.
Whatever else a photograph may be about, it is inevitably about photography, the container and vehicle of all its meanings.
A skillful photographer can photograph anything well.
In practice a photographer does not concern himself with philosophical issues while working; he makes photographs, working with subject matter that he thinks will make the pictures.