Within the depth-psychology corpus, ‘Fountain’ operates primarily as an alchemical symbol of generative, transformative, and sacred origin. The dominant treatment, consolidated in Abraham’s Dictionary of Alchemical Imagery, identifies the fountain as a name for the mercurial water or aqua permanens — the magical transforming substance from which all metals are said to be generated and which both kills and revivifies matter. Jung adopts this symbolism with characteristic psychological specificity: in Mysterium Coniunctionis he speaks of ‘the fountain of your soul’ being stopped by an evil spirit, rendering the soul sterile and barren — a direct equation of the fountain with the source of imaginative and creative life in the unconscious. In Aion, Jung extends the symbol into Marian and Messianic register, noting that Mary was invoked as pege, ‘fountain,’ in orthodox and Gnostic circles, linking the fish from the fountain to Messianic expectation. In Aurora Consurgens, von Franz traces the ‘fons animalium’ and ‘fons scientiae’ as indices of the living, inexhaustible source discovered within the alchemical treasure-house. Across these treatments, the fountain condenses several tensions: between creative plenitude and sterile obstruction, between the sacred feminine and mercurial transformation, between literal spring and archetypal origin. It matters because it marks the threshold where psychic vitality either wells forth or is stopped.