The chapter introduces two processes that endow mobility with centrality as a cognitive key for understanding socio-spatial transformations in the contemporary city. The first process is part of broader critical reflection on the role of spatial mobility in describing and assessing socio-urban changes. The second process interprets the contemporary city as a “site of sociability” (Amin and Thrift 2002), which can be understood by tracking the routinization of site practices that follow their own rhythms of appearance and disappearance. This leads us toward the heuristic value of interpretation of the rhythms of usage of the contemporary city, well provided by mobility practices. Working along these two lines, in this chapter we try to r...