 Having rediscovered the body as expressive and intentional, Merleau-Ponty turns in Part Two of Phenomenology to the perceived world, with the aim of showing how the pre-reflective unity of co-existence that characterizes the body has as its correlate the synthesis of things and the world; “One’s own body is in the world just as the heart is in the organism” (PP: 245/209), and its expressive unity therefore also extends to the sensible world. Merleau-Ponty develops this interpretation of the sensible through detailed studies of sensing, space, and the natural and social worlds. Sensing takes place as the “co-existence” or “communion” of the body with the world that Merleau-Ponty describes as a reciprocal exchange of question and answer: 