[….]” categories are for sorting photographs, not photographers. Photographers tend to make certain kinds of images with some consistency, but they also make departures from their usual work. [….] Photographs may fit well in more than one category, and more than one category may apply to any single photograph.”

Terry Barrett (the Ohio State University): “Criticizing Photographs: an introduction to understanding images” 2nd ed. (Mayfield Publishing Company, Mountain View,  Cal., 1996).