Cloud Atlas

Cloud Atlas, the new film from Tom Tykwer and the Wachowskis (based on the book by David Mitchell), is well-named.  Try to imagine creating an atlas of the clouds, and you have some sense of how hard it is to wrap words around this film.  Don't take that as an endorsement; there's a lot to say, both good and bad.  But it is one thing: ambitious.  And am…