"Learning is never cumulative, it is a movement of knowing which has no beginning and no end."

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Only recently serious research into the relationship between photography and art has taken place. Why has it been so long in coming ? In some respects historical research is analogous with that of science. The bringing to light of factual material and the development of ideas is to a large extent cumulative. But when artists themselves were, from about 1910, beginning to tear down the bastions protecting Art in its ivory tower, questioning the idea of Art with a capital 'A', photography was inevitably to assume a new stature both in the eyes of artists and the public, too.

— Aaron Scharf