Heliópolis (São Paulo) Banished from the city and from property ownership, the shanty is reterritorialised according to a mutant cartography that does not permit coding: neither sector, nor block, nor plot. The urban form is only construction - in it free space digs uncertain and unyielding furrows. Therefore, the house can only expand over what is already built. And daily routes, caught in improbable sequence and panned shots intertwine with lines that zigzag on ground level and lines that climb the irregular, almost hollow, bodies of the shacks. The cement roof is the precarious and collectively appropriate technique that can be used to achieve needs, demands and subjectivities. A multiplier plan for encounters and contingencies. Transitive outline between the house and the neighbourhood, comfortable for living or renting, terrace or viewpoint, the traffic and violent vigil: the roof is an escape from confinement and congestion. Some fresh air and community waves; 98.3FM included. P.D.: Heliópolis, 100 ha of land, 18 thousand buildings, 120,000 inhabitants, average monthly rent 202 dollars, is the largest favela (shanty town) in São Paulo, where people live, or survive, since the 1950, in a combination of social vulnerability, political resistance, police recurrence, urbanization irreversible.