A Picture You Already Know...
"Perhaps this is why working in series is so important to photography, for to shape a personal vision requires revisiting a subject over many images to create a more focused and particular view, rather than relying on the unique aspects of a single image. In other words, photography is particularly suited to the accumulation of and relationships between many images, rather than to the specific imprint on the individual image, to create a unique vision or outlook"
Sze Tsung Leong from A Picture You Already Know (2007)
A friend of mine just sent me a link to the full essay on Repetition and Similarity in photography written by Sze Tsung Leong in 2007. It's a fantastic essay from one of my favorite photographers.
Sze Tsung Leong's Horizons