He's just saying that the film has aged well. What sci-fi films from the 60's and 70's - besides Solaris and 2001 - do you think have aged well when it comes to visual effects?
Dark Star
Stalker
THX 1138
The Andromeda Strain
Fahrenheit 451
In fact most 60's and 70's sci fi movies looked much better than anything in the 80's, 90's or early 00's.
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Early CG and 3D animated effects were cheesy as fuck. That is what didn't age well.
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