The Polar Express is about faith and the power of imagination to sustain faith. It's also about the desire to reside in a world where magic can happen the kind of world we all believed in as children but one that disappears as we grow older.
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I think it's fun to play with worlds that you can add a lot of your own imagination to. With 'True Blood ' you're not limited by anything there are just leaps and bounds of the imagination you can take with these characters.