Not so much a film as a visual essay, exquisitely directed and photographed (by Sacha Vierny)... Difficult to watch but well worthwhile for those willing to be challenged.
Polar Express is not an attempt to do animation. It is a technology-based film.
It says something about the curious nature of film, that someone can be so alive on screen, when we're all too aware that they've passed. it underscores how we're mortal, and films are immortal (commenting on the death of Heath Ledger)