It’s said that Christopher Nolan spent ten years writing his screenplay for "Inception." That must have involved prodigious concentration, like playing blindfold chess while walking a tight-wire. The film’s hero tests a young architect by challenging her to create a maze, and Nolan tests us with his own dazzling maze. We have to trust him that he can lead us through, because much of the time we’re lost and disoriented. Nolan must have rewritten this story time and again, finding that every change had a ripple effect down through the whole fabric.