Taylor Knight reveals the way in which phenomenology initiates a return to ontology construed through a dialectical relationship between being and element. Within phenomenology's return to the elemental, Merleau-Ponty's late philosophy is a key locus, opening critical paths forward into an ontology for the ecological age. With reference to his phenomenological forebears - Heidegger, Husserl, Levinas - his non-phenomenological influences - Bachelard, Schelling, Freud - and his dialogue with Greek thought - Heraclitus, Plato, Aristotle Knight shows what is authentically new in Merleau-Ponty's late ontology.