3D Cinema vs 3D life

I thought it would be relevant to briefly talk about the film Avatar (written and directed by James Cameron.) I saw it the other day at the cinema and it interweaves well with the concept of this project. The film shows this idea that we can transport the human mind into another body ( in the films case the avatar.) The word Avatar itself comes from the religion Hinduism and translates as "incarnation", but more accurately as "appearance" or "manifestation. The point Im trying to make here is that I found it very strange that this film makes this seem so fantasy based as isn't playing a computer game as a character an Avatar?
If thats not enough at the start of every major games console now you are prompted to 'create your Avatar' your virtual self.


Example of a Ps3 Avatar in the 'Playstation Home' Virtual world.

Another thing with cinema at the moment is the idea of making things 3D?
Isn't the world already 3D?
Maybe we should go for a walk in the park instead of watching a film.
I dont know... Just seems strange