When I first rented Solaris, there's a good chance it was my first Tarkovsky film. I think it was one of my phases where I wonder something like "what does genre X look like when its from culture Y?" Such as what is Korean death metal? What is Indonesian horror? Or what is Russian Sci Fi?
Solaris was Tarkovsky's third film, and in some ways a response to Stanley Kubrick's 2001: A Space Odyssey. I've watched 2001 recently just coincidentally and the beginning especially I clocked as a response before I logged into Wikipedia and saw that was cited on there too. I have called 2001 perhaps my favorite film of all time, and so I watched it with that idea in mind for a great amount of Solaris, though I will admit my mind wandered at times.
It's interesting that as Tarkovsky went on his films became more esoteric and more personal, and though he infuses Solaris with some of his personality, it does feel a lot more like an interpretation of a thing versus an organic thought that came from his mind. I haven't read the original novel, but from what I read Tarkovsky added the Earth segments and some of the relationship stuff, as a response to 2001 which he felt was too clinical and interested in technology over human experience.
Solaris is a planet where scientists have a space station in orbit, and our main character Kris Kelvin is sent there after scientist Gibarian dies. He quickly uncovers that something odd is happening, and it has to do with transmissions sent to the ocean below them on Solaris. It seems that the transmissions are being interpreted in a way, and the planet sends Visitors to the crew, built on their thoughts and dreams and feelings, and those Visitors interact in bizarre and psychological ways.
Thematically there is some stuff about sacrifice, about deception of ourselves and our reality, about inner happiness and external happiness, and of course about martyrdom.
In a way, this is the least Tarkovsky of the Tarkovsky films. Andrei Rublev is very much about Tarkovsky's interests, Mirror is extremely dense and esoteric, Stalker dives head first into weird expressionistic diversions, Nostalghia is extremely Tarkovsky, and then The Sacrifice could be the most self aware of his films. Only Ivan's Childhood could rival this one, which I will rewatch after I rewatch Andrei Rublev.
There is a moment of unintentionally funny translated dialogue here, who knows what was actually said but what the subtitles show is:
Mother: "Are you happy?"
Kris: "Happiness is an obsolete idea."
Mother: "Oh. That's too bad."
Solaris is really good, really eerie in parts, slightly tipping into the horror that will be present in Stalker as well. It's the most straight forward of his major works, and in that way I like his personal stuff more, but I'll still give this 4 stars.