The aim of this paper is to interpret the problem of subjectivity in Maurice Merleau-Ponty’s philosophy, by describing subject as ecological; insofar as it is intimately related to the world and to the other living beings. The authors will show that the French phenomenologist conceives the principle of co-relation "subject-world" as an existential pre-determinative field. It can be noted that redefining the Husserlian concept of Einfühlung, enteropathy of the living-being in the field where it is situated, becomes a central problem. Furthermore, following the notes of the courses on Nature, the authors will show that the existential field crosses the Lebenswelt and will propose an interpretation of this relationship through the concept of play. The subject’s individuation process presents itself like a play among pre-individual singularities.
Keywords: Ecology, Einfühlung, Merleau-Ponty, Phenomenology, Play, Subjectivity.