There's a reason it's considered one of the greatest. Every time I think I've figured out what makes a movie work, or what makes it interesting; I look at 2001, and it seems to defy all the rules. I can't figure it out despite studying it to death. It really is remarkable.
this is one of the most beautiful and mysterious films i've ever seen and it gets more entrancing with every viewing. tbh I have no interest in trying to formulate theories or "explain" 2001 because I feel like doing so would be a disservice to its enigma (....if you're into that kinda thing live your life but thats just how this girl feels.....)
The looks, the music, the vision, this movie has it all. The veeeery long indulgent shots somehow work a treat and there's something so wonderfully satisfying about the practical effects, ah, it just looks stunning. I'd recommend reading the book first, I suspect I'd be seriously confused if I hadn't, though in a good, though-provoking way.