Regarding the movie, the cinema industry rated 2001 the highest rank possible or "chef d'oeuvre". Very few films (not only in sci-fi, but of any genre) get this rate in cinema.
So for people too used to usual unnecessarily flashy hi-speed animation sci-fi movies, it can appear boring. 2001 is actually the only movie that describes emptyness of space the right way : there's no sound in space. So how can we hear explosions in those myriads of "space scenes" in other sci-fi movies? Because nowadays movies without violence, lightening fast animation or big explosions sounds all way through don't bring the millions.
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Inconnu, once again, you seem to have understood my goal very clearly. I also have the book and the movie here, and you understand why I opted for such an extreme dark black. I want to thank you to remind me of this. I'll let this thread go on for a while and continue to experiment with the constructive comments. At the same time though, I am beginning to think, with your remark here, that I could also accept the initial concept as it is.
On my PC, the monoliths look like they are creating a "hole" on my screen, especially the upper one, because it has no buttons or visible sides.
Thanks a lot again.