FAQ for
The Invisible (2007) More at IMDbPro »

Yes. The original was a Swedish movie by the same name (aka Den Osynlige). The imdb page is:

http://imdb.com/title/tt0298491/

There's also a trailer and some info on the Swedish movie at:

http://web.mac.com/joellou/iWeb/The%20Invisible/Downloads.html

Enjoy!

Nick cannot move things (books, guns, chairs, etc.) in the world while he is in his subconscious. But when he moves his body from the rocks and keeps it afloat, he is actually moving himself so he can do this. It would be like a trance-like movement. Nick (the body) is actually moving because his subconscious is controlling him. . An alternative theory that has been advanced is that he is not moving his body at all; we see elsewhere that while he can appear to move things from his perspective, they often go right back to where they were in the blink of an eye. Either way, we know that his insubstantial ghost is definitely not doing anything that hasn't been well-established earlier in the movie.

It is not completely clear why the ending was changed. In the ending to Den Osynlige, Nikolas asks Annelise to pull his life support in the hospital since he will never wake up and then Annelise turns herself in. While in The Invisible, Nick wakes up and Annie, having unfortunately been morally injured, dies lying next to him. It's opened for speculation.