I visited Sao Paulo, Brazil in the early 1990s. Skyscrapers seemed to stretch in all directions. At night the view was stunning from the deck at the top of our hotel. And I remember the continual din night and day of cars with awful mufflers.

Sao Paulo is the largest city in South America, over 10.6 million paulistanos. Today, some of them are crawling to the top of their skyscrapers, taggers leaving their marks high above. Why? Watch this minute and a half clip from Jao Winer’s documentary Pixo. For more here’s an article Pixacao: Sao Paulo’s acrobatic Urban Graffiti Movement from Environmental Graffiti.