This dissertation is the result of an investigation about forms and possibilities of political action in the contemporary city. In direct counterpoint to the project and the political representativeness crisis established in contemporary times, the actions of tactical urbanism seemed initially to respond to the aspirations of this investigation. These acts of appropriation and activation of public spaces are put in place by the populations themselves. However a careful review of the political speeches produced by the agents of the Batata Precisa de Você, a case of tactical urbanism developed in Largo da Batata (SP), shows the weakness of any political act based on the opposition between civil society and State. We explain how these actions are crossed by biopolitical power and inscribed inside structures of the neoliberal cities. But if the complex and microphysical cartography of contemporary relations of power affects the bodies and lives of each person and everyone, then a political action does not necessarily takes place in defiance of the State apparatus. Thus we see emerge from a myriad of practices the emergence of its micro political potential, amongst them art in the aesthetic regime. Its eminently dissensual character produces cracks in the distribution of the sensible and, in contact with the emancipated spectator, enables the production of singularities, in opposition to the mass experiences that prevail in most of great contemporary cities. At the end of this dissertation we focus on the relations between body, politics and city in the artistic works of the collective Opavivará!, presented as an essay.