"There is one thing the photograph must contain, the humanity of the moment. This kind of photography is realism. But realism is not enough - there has to be vision, and the two together can make a good photograph."

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Substance is a subspecies of value. When you reverse the containment process and define substance in terms of value the mystery disappears: substance is a "stable pattern of inorganic values." The problem then disappears. The world of objects and the world of values is unified.

— Robert M. Pirsig