Have you seen Arrival yet? If not, then I’m issuing a SPOILER ALERT. Don’t read on unless you don’t mind knowing what the aliens in the film look like. Arrival has captured the minds and hearts of almost everyone around the world in the last month or so. An extraordinary tale of language, unity and time. It’s a puzzle that is bewildering but never pretentious, and it’s probably one of the best science fiction films of the decade.