The author seeks an explanation for Merleau-Ponty’s expression “the body understands”, to which he applies a real value: the objects of the world have a signification that the body grasps by way of perception. The analysis focuses on Phenomenology of Perception and on notes from two courses: Le monde sensible et le monde de l’expression and La nature. There is a constant allusion to the I can as an underlying and grounding mode with regard to the I think. Therefore, the French philosopher grants a central role to the movement that demonstrates the interweaving of the body with the world.