Arthur C Clarke's input
Rewatching (again) and it struck me that the trip to and across the moon was very reminiscent of his books. I've always assumed that most of the film is Kubrick, apart from the Sentinel on the moon, but maybe I'm wrong. Perhaps Clark contributed a fair part of the vision as well?
Somewhere I have Clarke's book about making this film. It's many years since I read it but perhaps I should dig it out to answer my own half question.