I find the first 1/2 of 2001 pretty dull, it's well shot but very dry and remote.
Memorable but a drag.
The Hal sequence is sublime and very creepy for a U certificate, nothing is shown, everything is psychological. Claustrophobic and paranoia inducing.
Then the whole film just freaks out from there on in.
Classic.
Imagine seeing that on acid with no prior knowledge of what to expect.
They'd be scraping you off the walls.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.