When Bowman the Starchild finds himself orbiting Earth, this is so murky an ending that it defies realisation without explanation. As I understand it, he's there in relation to the monolith, as it instructs "Moonwatcher" on the Art of Murder, where the movie started from. Equally unclear is that when Bowman went through the stargate, or whatever, he became the Starchild at some point long before he arrived at the alien house. He was only brought there, apparently, so that he could accept the loss of his Humanity, before his debut as a space zygote. It's cool to leave some questions open, things for the audience to ponder, like what the probe's talking to the whales about in The Voyage Home, for example. But this is too much info to leave out, I feel. At the same time, considering how Kubrick decided to present this transformation, I don't know how it could've been conveyed, otherwise. I don't mean to infer that this movie's not a cinematic achievement or any of that, because it certainly redefined Sci-Fi as the world knew it. But did any PhD's out there ever make any of those connections without reading the book, I wonder? I tend to doubt it ...