Reading 2001 after the movie, it was obvious that Kubrick's movie vision left out transitional scenes that could have made it less confusing. Even as a long time Sci-fi fan, I had trouble with the closing sequences of Poole aging in that room and then abruptly the fetus floating through space while Also Sprach Zarathustra plays again. The novel explains it.
I never met anyone who got the closing sequence above. However, the classical Strauss music Kubrick used was genius for his vision.
Good insights.
When it came out April 2, 1968 I was not yet out of college and it seemed mystically special in its Cinerama version.