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We used a method that I call "collaboration by difference." Collaboration by difference is an antidote to attention blindness. It signifies that the complex and interconnected problems of our time cannot be solved by anyone alone, and that those who think they can act in an entirely focused, solitary fashion are undoubtedly missing the main point that is right there in front of them, thumping its chest and staring them in the face. Collaboration by difference respects and rewards different forms and levels of expertise, perspective, culture, age, ability, and insight, treating difference not as a deficit but as a point of distinction. It always seems more cumbersome in the short run to seek out divergent and even quirky opinions, but it turns out to be efficient in the end and necessary for success if one seeks an outcome that is unexpected and sustainable. That's what I was aiming for.

had the students each contribute a new entry or amend an existing entry on Wikipedia, or find another public forum where they could contribute to public discourse. There was still a lot of criticism about the lack of peer review in Wikipedia entries, and some professors were banning Wikipedia use in the classroom. I didn't understand that. Wikipedia is an educator's fantasy, all the world's knowledge shared voluntarily and free in a format theoretically available to all, and which anyone can edit. Instead of banning it, I challenged my students to use their knowledge to make Wikipedia better. All conceded that it had turned out to be much harder to get their work to "stick" on Wikipedia than it was to write a traditional term paper.

Tião, like the other catadores profiled in the film, is far from an emaciated beggar living out a miserable existence on the way to an early death. But he is humble and has few expectations of earthly glory. Although a social outcast, he organized an association of pickers who live and work in Jardim Gramacho, one of the world’s largest garbage dumps, and likes to think of himself as an environmentalist.

The film — co-directed by João Jardim and Karen Harley, and photographed by Dudu Miranda — observes this giant landfill from every perspective.

Tião is the most prominently featured of several pickers profiled by the film. Their lives are changed forever when they are chosen to collaborate with the artist Vik Muniz, a São Paulo native who is now based in Brooklyn and is well known for his re-creations of famous artworks using unusual materials. Those pieces include two Mona Lisas — one made of peanut butter, the other of jelly — and a “Last Supper” made of chocolate syrup. For his Sugar Children series, he took snapshots of children on a plantation in St. Kitts and copied the images by layering sugar on black paper and photographing the result. The film observes the creation of his recent monumental series, Pictures of Garbage, for which Mr. Muniz, who grew up poor, returned to Brazil.