A Sports field. A group of men on the move. A banal scene disturbed only by the strangeness of the repetition of the same gestures, of the same course. Following the lines of the playing field, a man tirelessly goes around in circles within a limited perimeter, in obedience to this organised space. This literal revolution, self-contained, traces the shift from topography to psychology and back. These men are prisoners and this repeated course reveals the –sometimes subliminal– integration, of their trajectories circumscribed in an incarceration environment and their spatio-temporal conditioning. This obedience to a physical and mental disciplinary structure also paradoxically offers a way of reclaiming time. This systematic surveillance is time in action: measurement by walking, a tangible experience of the passage of time. It evokes duration stretched to intolerability felt by the detainee and life in a cell, consumed by boredom and monotonous waiting.