The way the future was.
One of the few science fiction movies that is solidly sf, 2001 has aged well, although we now know that people swim in zero-gravity, making some of the special effects dated—at least for moment. The long-term effects of living in a gravity-free environment mean we may yet see wheeling space stations and ships with artifical gravity sections. We're still waiting for that space plane, too. Hopefully that's soon to come.