Solaris: Another View
This movie is notable in that it fails to pull people into that state of mind
I have not read the book. I agree that the film did not do this as well as it could have (or the story/concept deserves), but there were 3 or 4 scenes where they actively discuss this theme rather pointedly. It's clearly supposed to be the driving theme.
I plan on reading the book between Christmas and New Years, if I happen to find it at the bookstore.