I am writing this review for those who claimed this movie has parts that are incomprehensible. Let me begin saying that you are right. The thing is this. There are movies wich are so successful, that a book is written afterwards based on it, like Star Wars. There are books so great that someone attempts to make a film of them, like The Lord of the Rings. Neither of these is the case of 2001. This a very peculiar situation in wich movie and book were developed simultaneously and were released within only a couple of months of difference. And even though there are some slights differences between book and movie, both belong together as a unit. Each one explains the other, so you can't read the book wihout the movie or watch the movie without having read the book. If you like good science fiction, that is science fiction wich is not like Star Trek or the Chronicles of Riddick, you should buy the movie and the book. 2001 is the proof that it is possible to make great science fiction: a story that portraits extraordinary events wich allow to explore the human condition and at the same time give entertainment.