10 on Ten (2004) is a documentary written, directed, and starring the great Iranian director Abbas Kiarostami. Kiarostomi directed the film Ten in 2003. 10 on Ten is presented on the same Zeitgeist DVD as Ten. We wouldn't have sought out this movie, but we watched it because we like Kiarostami's work, and we obviously had easy access to the film.
The movie takes place entirely within Kiarostami's car, and is divided into ten parts. Ten also takes place entirely within a car, and is divided into ten parts. However, 10 on Ten isn't just concerned with the movie Ten. Kiarostomi gives us an overview of how he makes movies. Sometimes he references Ten, but other times he speaks about other films he's made.
Kiarostomi tells us that he never went to film school. He is entirely self-taught, and he points out that some of his methods are unorthodox and might not work for another director. The topics he covers are basic, not esoteric: camera, subject, script, location, etc. However, as simple as the headings are, the information he presents to us is sometimes esoteric and difficult to grasp. (At least, I found it difficult to grasp.) Still, I understood more than enough to make me glad I had watched the film.
This isn't a movie for everyone. However, if you're a Kiarostami fan, or if you're interested in how a director thinks when he or she is making a film, then you'll enjoy 10 on Ten.
I believe that the movie Ten is definitely worth seeing. Once you've sought out and seen Ten, you could consider watching 10 on Ten. If you don't like it after the first two or three chapters, just hit eject. If you like the movie, watch it to the end. It should work as well on DVD as it would on the large screen.