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Objectivism, philosophical system identified with the thought of the 20th-century Russian-born American writer Ayn Rand and popularized mainly through her commercially successful novels The Fountainhead (1943) and Atlas Shrugged (1957). Its principal doctrines consist of versions of metaphysical realism (the existence and nature of things in the world are independent of their being perceived or thought about), epistemological (or direct) realism (things in the world are perceived immediately or directly rather than inferred on the...