Mark Klett – Time Studies « The PhotoBook:
Klett has tapped into the earlier photographic processes to explore the element of time by extending the duration of his exposures. He effective uses two variations, an extended long exposure to constant capture the light and a series of intermittent exposures over an extended period of time. To me, the process is like creating some mysterious treasures, because you can not always foretell what the final results will appear like. With time and practice, you can kinda guess approximately what the resulting image might look like, but you can never tell with absolute certainty.