From the scrappy metal shacks packed tightly on the banks of the thin Jukskei river, the sparkly skyline of Johannesburg's richest neighbourhood less than two miles away is another world.Bags of refuse for sale to recycling companies line a muddy path to a vegetable garden tended by residents of the informal settlement at the foot of the high-rises of Sandton, South Africa's economic hub.A light powered by a makeshift electrical connection shone at the doorway of the rusted shack where Bryan lives with his wife and nine-year-old son.