An intense exercise of looking at a rockface shot near the waterfalls of Riviere au tonnerre, on the North Shore of the St-Lawrence river. A meditation about opacity, about the fissures that can open up anything, any situation on the infinity of meaning. It is the ontological moment, the moment of pure seeing, amongst the episodes of the 'Places and Monuments' series that is a project of exploration of the fissures that crack any banal scene of daily life, any anonymous crowd, any forgotten monument, and that let seek through, until it explodes, the invisible constellations of history.