It is possible that when the movie first came out, you were one of those who became interested in these blue people who were living in a different dimension. You start to like what they can offer and how the main character in the story also enjoyed himself while he was there in their world. It might make you think of the times when you also would like to go away from your usual life and live a different one even for a while. The Avatar game can also give you that chance as well. Yet, it will be best if you can place this desktop background as your computer's background, it will remind you of other worlds often.