Avatar, James Cameron's blockbusting 3D film, is both profoundly silly and profound. It's profound because, like most films about aliens, it is a metaphor for contact between different human cultures. But in this case the metaphor is conscious and precise: this is the story of European engagement with the native peoples of the Americas. It's profoundly silly because engineering a happy ending demands a plot so stupid and predictable that it rips the heart out of the film.
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