The sun has slipped behind the tarpaulin roofs of a Mumbai slum. Day labourers are streaming home from ten-hour shifts working on construction sites or tending the gardens of nearby private schools. In this particular web of slum lanes, many workers are Dalit, the untouchables of old—a status so low they were not even part of the caste order. Most months, their financial situation boils down to what people around here call ‘earn and eat’. But for two years, some of these families set aside what little they could for bricks and mortar, and now they have a deep-blue room, five metres a side, that stands distinct from all the other hand-built homes in the slum.