"There is in fact no such thing as an instantaneous photograph. All photographs are time exposures, of shorter or longer duration, and each describes a discrete parcel of time. This time is always the present." (The Photographer's Eye - John Szarkowski)
"The first thing that the photographer learned was that photography dealt with the actual; he had not only to accept this fact, but to treasure it; unless he did, photography would defeat him." (The photographer's eye - John Szarkowski)