Up their alley: About half of Mumbai's 16 million residents live in informal settlements known as slums, the largest of which is Dharavi. Between 600,000 and 1 million people call Dharavi home, but for many, it is also their place of business, the site of approximately 15,000 cottage-industry factories powered by an unflagging entrepreneurial spirit. "You in the West so easily see the slum as a negative concept. ... But Dharavi has also been mirroring India's economic revival," one Dharavi advocate told The Guardian. Above, a boy looks on in an alley at Dharavi on April 5, 2008.