The purpose is to retrace phenomenology's argumentative path towards temporality as the foundation of phenomenality as presentation. The next step is to construct another paradigm based on movement and the processes of differentiation involved in it. The confrontation between these two types of approach, one related to Husserl's genetic phenomenology, and the other which allows us to think of presuppositions for a phenomenology of difference and event based on Merleau-Ponty's lateral writings in the 1950s, serves to question the foundations of this type of philosophy. The final aim is to show how space and time can be described from the point of view of movement.