The groundbreaking classic of twentieth-century German philosophy now available in English—with an introduction by J.M. Bernstein.Helmuth Plessner's Levels of Organic Life and the Human, draws on phenomenological, biological, and social scientific sources to offer a systematic account of nature, life, and human existence. The book considers non-living nature, plants, non-human animals, and human beings a sequence of increasingly complex modes of boundary dy...