"Rio de Janeiro is a city with a population of just over six million in its central urban areas, of which, according to officials, an estimated 20% are residents of favelas. These favelas vary enormously in size and character. These urban islands, like those of the earth’s waters, have formed according to several genealogies and geologies. Some, like continental islands, share a history and underlying structure with those around them, as if they have collectively broken off from a land mass. Others, like volcanic islands, seem to develop independently and suddenly from more isolated and turbulent forces. Still other favelas, like coral atolls, build slowly on an underlying urban structure. These metaphors show how favelas differ in their relationship to their surroundings—their seemingly insular status belies the fact that submerged structures tie them to the city." - Steven Perez from Bookmarklet