James Cameron's Inspiration for Avatar

The movie Avatar by James Cameron takes the Hollywood Film industry in to a new dimension. State of the art visual effects has been rendered in order to produce this epic animation.  Avatar receives major awards including Academy and Golden Globe. Truly the movie is a success but some critics noticed the similarity with the Disney's Film- Pocahontas. Pocahontas was released during the 90's and made a mark to Disney's Classic Film. Avatar takes the stage in 2008 and produce countless ground breaking records. Let's take a look to this guy's opinion regarding the two movie.

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Is it coincidence?