We deconstruct and reconstruct the recent release “Arrival,” staring Amy Adams, Jeremy Renner, and Forest Whitaker, and based on a story by Ted Chiang that we discussed nearly 300 episodes ago. There’s praise for the story’s restraint, quiet tone, beautiful scenes of solitary obelisks in remote cow pastures, and realistic portrayal of its main characters. We also enter a spirited debate about the film’s sci-fi plot mechanism, the way its aliens (and alien language) are portrayed, and the morality of a choice that one character may—or may not—have made.