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.

Be still with yourself until the object of your attention affirms your presence.

Reaching a 'creative' state of mind thru positive action is considered preferable to waiting for 'inspiration'.

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

A very receptive state of mind... not unlike a sheet of film itself - seemingly inert, yet so sensitive that a fraction of a second's exposure conceives a life in it.

If all your life means to you is water running over rocks, then photograph it, but I want to create something that would not have existed without me.

Students were taught by doing.