Just an interesting aside: Lem is famously known for Solaris, mainly due to the movie adaptations. According to Lem the movies don't really reflect his vision:
..to my best knowledge, the book was not dedicated to erotic problems of people in outer space... As Solaris' author I shall allow myself to repeat that I only wanted to create a vision of a human encounter with something that certainly exists, in a mighty manner perhaps, but cannot be reduced to human concepts, ideas or images. This is why the book was entitled "Solaris" and not "Love in Outer Space".