Across the depth-psychology corpus, ‘vibration’ functions as a disputed but recurrent explanatory hinge between the physical and the psychic, the somatic and the cosmic. Its treatment ranges from rigorous acoustic physics—Plato and Aristotle grounding vibration in the mechanics of struck bodies and transmitted impulse—to the esoteric cosmologies of Evans-Wentz and Govinda, where each entity, from grain of sand to deity, possesses a characteristic vibratory rate whose knowledge grants transformative or destructive power. Ficino’s sympathetic vibration, mediated by Thomas Moore’s scholarship, occupies a middle position: the cithara string that sounds when its tuned twin is struck becomes a model for the soul’s resonance with planetary influences, a ‘natural magic’ that grounds Ficino’s entire music therapy. Jung stands apart as the critical voice, dismissing theosophical invocations of ‘vibration’ as mere verbal convenience masking conceptual vacuity—a rebuke that nonetheless registers how pervasive the term had become in early twentieth-century occult and psychological discourse. At the somatic edge of the corpus, Strassman’s DMT subjects report vibration as raw phenomenological fact: overwhelming, disintegrative, verging on annihilation. Sri Aurobindo employs the term epistemologically, as the medium through which intuitive mind grasps objects indirectly. The Philokalia introduces vibration as a pneumatological category—the Spirit’s wordless intercession rendered as felt tremor in the heart. Taken together, these positions reveal a term whose semantic instability is itself theoretically significant: vibration marks the contested border where physics, occultism, somatic medicine, and mystical theology intersect.