According to Aristotle, there are two models of vision. The one is a contact model, according to which the realization of vision is explained by the process of the contact between light and eye, and the other is a medium model, according to which the realization of vision is made possible only through some medium that constitutes a distance between a seer and something seen. Aristotle defends the latter model, criticizing the former one. Merleau-Ponty’s philosophy of vision and painting, which he explicated in his last work Eye and Mind, can be interpreted as a development of the medium model of vision. He especially focuses on the role of illumination, which plays a role of the medium and constitutes the distance and makes a vision possible. All painters are trying to paint this role of illumination, which constitutes “depth, space, and color,” that means, the “flesh” of the world. In this sense, Mereau-Ponty’s ontology of vision and his ontology of “flesh” in his later works can be interpreted as a development of his and David Katz’s phenomenology of illumination.