Now with spoilers for my week and a great movie

Starting tomorrow the Bell Lightbox is showing a 70mm print of 2001: A Space Odyssey. If you miss this you're dead. Or not in Toronto.

Now, watch out because in the next paragraph Stanley Kubrick spoils the movie, or as much as can be spoiled with a mere plot description:

You begin with an artifact left on earth four million years ago by extraterrestrial explorers who observed the behavior of the man-apes of the time and decided to influence their evolutionary progression. Then you have a second artifact buried deep on the lunar surface and programmed to signal word of man’s first baby steps into the universe—a kind of cosmic burglar alarm. And finally there’s a third artifact placed in orbit around Jupiter and waiting for the time when man has reached the outer rim of his own solar system.

When the surviving astronaut, Bowman, ultimately reaches Jupiter, this artifact sweeps him into a force field or star gate that hurls him on a journey through inner and outer space and finally transports him to another part of the galaxy, where he’s placed in a human zoo approximating a hospital terrestrial environment drawn out of his own dreams and imagination. In a timeless state, his life passes from middle age to senescence to death. He is reborn, an enhanced being, a star child, an angel, a superman, if you like, and returns to earth prepared for the next leap forward of man’s evolutionary destiny.

That is what happens on the film’s simplest level. Since an encounter with an advanced interstellar intelligence would be incomprehensible within our present earthbound frames of reference, reactions to it will have elements of philosophy and metaphysics that have nothing to do with the bare plot outline itself.

It's from a 1969 interview.