There are many underling themes, all of which I've seen before. The big difference is they are wrapped in the most breathtaking visual experience I have ever had in a movie and the story is captivating. James Cameron has made this imaginary world and people (the Na'vi) easy to believe in and it contains the best 3D and CGI I have ever seen. After seeing this movie I'm convinced the most beautiful women in the Universe are blue skinned, 10 feet tall and have a tail. It's 240 minutes of pure entertainment!