Solaris (1968)

The planet Solaris is apparently uninhabited, except for the scientists from Earth who operate a small research station. The surface of the planet is covered by water, and the visitors marvel at the range of patterns and forms taken by the waves, which act in an awe-inspiring and sometimes frightening manner. But cryptic events start taking place among the researchers, and the only possible explanation is that the ocean is responsible. Can a geographic fact, a part of the landscape, really be a life form? Or can some other explanation be found?