“The Shawshank Redemption” is not a depressing story, although I may have made it sound that way. There is a lot of life and humor in it, and warmth in the friendship that builds up between Andy and Red. There is even excitement and suspense, although not when we expect it. But mostly the film is an allegory about holding onto a sense of personal worth, despite everything. If the film is perhaps a little slow in its middle passages, maybe that is part of the idea, too, to give us a sense of the leaden passage of time, before the glory of the final redemption.