This article studies the collective memory in the urban world as a result of the action of individuals and groups, showing the importance of the specific forms of social life arrangements according to the complexity and dynamics of the modern life of its inhabitants. It proposes an ethnography of duration to deal with time and memory in the anthropological field. The idea is to deepen the comprehension of the process of rooting/derooting of social identities in contemporary world. It also suggests the notion of rhythm as a way to know the movement of continuity/descontinuity as a system of value used by those groups and to understand their sociability forms in the city context.
collective memory; ethnography; sociability; urban life; city; image; time