The ephemeral practices can unexpectedly be realized in urban contexts, casting doubt on the planned, designed and politically controlled space. Practitioners appropriate existing spaces through territorial tactics, and they construct an alternative and heterotopic space, that differs from the previous for its uses, potentialities, norms. Produced in plural and sometimes ambivalent processes, these spaces are realized through putting into context and relation physical spaces, moving bodies, institutions, atmospheres, and sociotechnical tools. Part of ethnographic research realized in the context of the breakdancing in Milan, this contribution highlights the importance of music and sound in the practices of territorial re-appropriation, as an instrument of the redefinition of urban, material and symbolic boundaries. More specifically, it will start from a specific space, the mezzanine of the underground station of Porta Venezia, in order to deepen the capacities of the interstitial spatial formations to redefine new urban imaginaries.
Keywords: Spatial reappropriation, aural territories, hip-hop, breakdancing, ethnography