Mm, that shifting reality stuff I would be wary of seeing filmed, because its conceptual interest was very internal. But The Prestige is more of a yarn, so I think it'd be fun to see it brought to life -- I can think of several better films of good books, which all fall into that broad category of the story looking after itself and the visuals adding vividity. Farewell my Lovely (Dmytryk), Strangers on a Train, Frankenstein (Whale) or more recently Schindler's List, Fight Club, Trainspotting... none of which are brilliant books or all-time favourites of mine, but nor is The Prestige.