While we cannot describe its appearance (the equivalent), we can define its function. When a photograph functions as an Equivalent we can say that at that moment, and for that person the photograph acts as a symbol or plays the role of a metaphor for something that is beyond the subject photographed.

Let the subject generate its own photographs. Become a camera.

The reason why we want to remember an image varies: because we simply 'love it,' or dislike it so intensely that it becomes compulsive, or because it has made us realize something about ourselves, or has brought about some slight change in us. Perhaps the reader can recall some image, after the seeing of which he has never been quite the same.

Photography is a language more universal than words.

Students were taught by doing.

One does not photograph something simply for 'what it is', but 'for what else it is.

If I have anything to give you through camera, it must be of myself. … A gnawing burns inside … to make something of myself worth giving.