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Henri Ey attempted to explain the genesis of mental illnesses from a clinical point of view. Thus, he developed the organo-dynamic model, which refuted the Cartesian dualism opposing mechanicism (De Clérambault) and psychogenesis (Freud). Its theoretical development continued for almost 40 years. He presented an initial version in the Monograph de 1938 in which Jackson’s theories are the common thread of his approach. According to this point of view, mental illness is the effect of a dissolution of consciousness (giving negative symptoms) as well as of a liberation of the most automatic instances of the nervous system (generating delirium and hallucinations). Ey gradually enriched his model. He followed up the publication of Conscience with Traité des Hallucinations and Des idées de Jackson à un modèle organo-dynamique en psychiatrie to introduce the “psychic body.” The latter enshrines an innovative phenomenological vision that distances it from Jackson’s physicalism. We posit that the “psychic body” completes the organo-dynamic model. With this concept, a true oxymoron, Ey proposes not only a holistic vision of the genesis of mental illness but also a humanistic approach to psychiatry.