" We can elaborate a valid concept of Nature only if we find something at the jointure of Being and Nothingness. Despite what Bergson says, there is a kinship between the concept of Nature and radical contingency. In order to elaborate this concept, we have to leave positivism or negativism, which maintains a separation between the objective and the subjective, and which thus makes impossible the subjective-objective that Nature will always be. "

― Maurice Merleau-Ponty , Nature: Course Notes from the Collège de France