Since the 1950s, Singapore had a city centre surrounded by slums and squatter colonies. Brick factories were created to help build houses in effort to end urban slums. They thus expand the existing urban slums. Informality of land tenure is a key characteristic of urban slums. This crowds city slums and aggravates the infrastructure and sustainability of city life. Like most slums, it is overpopulated. In the east are factories and some slums. Kibera and other slums developed throughout Nairobi. The Slessors lived in the slums of Dundee. In the slums and other areas outside military control, however, lawlessness escalated. She begins to feel homesick, and is uncomfortable living in the slums. Kenya's capital, Nairobi, is home to Kibera, one of the world's largest slums. The film tells the story of a 12-year-old boy living in the slums of Beirut. Large areas, deemed "slums", were cleared. CGI is also widely used as building material in African slums and informal settlements.