Within the depth-psychology corpus, ‘lung’ occupies a curious double register: it is simultaneously a physiological organ and, in the archaic and classical traditions that feed depth-psychological thinking, a seat of mind, emotion, and prophetic consciousness. The most sustained treatment appears in Onians’s philological archaeology of Greek thought, where the phrenes — long equated with ‘lungs’ — are shown to have functioned as the organ of cognition, feeling, and inspiration before the diaphragm appropriated that name. Padel, working adjacent to this tradition, illuminates how the lungs participate in the ancient hydraulics of breath and emotion, channels through which liquid and pneuma alike pass. Plato’s Timaeus offers a philosophical anatomy in which the lung is placed around the heart as a buffer, cooling the spirited element so that passion may serve reason. Hakuin Ekaku, from the Zen medical tradition, situates the lungs within a five-organ cosmology governed by the metal principle, coordinating the exhaled breath with heart and the inhaled breath with kidneys and liver. Ogden’s somatic-psychotherapy tradition treats the lung functionally, as the medium through which breath regulation intervenes in trauma and dissociation. Across these registers — archaic Greek, Platonic, East Asian, and contemporary somatic — the lung emerges as a threshold organ: neither purely visceral nor purely mental, but the site where air, affect, and consciousness interpenetrate.