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In many institutions that care for persons with autism, the days are arranged with activities and there is often a walking activity included. It is a simple activity where patients can walk, for a period of time, in the city or in the forest. Nonetheless, this activity can be seen as a group mediation that mobilizes the patients. Using an excerpt from an observation of this activity, this article examines the therapeutic stakes of such an activity and the epistemological stakes of its theorization. Using this mediation as a therapeutic means raises the question of a theoretical approach that can integrate what happens in such a group. How can the archaic and body idea in a group psyche be understood thanks to metapsychology of the third type as interactions between three levels: inside the psyche, between subjects and in the group.