by Claudine Zap A summer blockbuster where thinking is involved? Yes, " Inception ," has lots of action and chase scenes. But the sci-fi thriller that stars Leonardo DiCaprio also has an intricate plot, a large part of which takes place in the sleeping minds of its characters. Needless to say, the movie's mazelike story left critics confused â€" not that there's anything wrong with that. Or is there? The movie, like a dream, is subject to interpretation.