Second one should be Solaris, if you’re into SciFi or The Mirror if you’re not of if you’d like a challenge. I think The Mirror is the better movie, the woman (stand in for T’s mom) looking at the wheat field (T had these specifically planted for the film!) haunts me to this day.
I personally couldn’t relate to The Sacrifice, perhaps his most personal film. His earlier films (Ivan and Rublev) I could not watch at all.
To be a genius artist like him in the Soviet Union meant privileges unheard for art film directors in Europe (let alone US), eg see the wheat field thing above. It also meant you’re at the mercy of the “masses”. I had read an article once that included a comment for The Mirror from a regular filmgoer, saying after 30mins it caused such a headache! The funding was based on such feedback and the movie was labeled as elitist (it is) which greatly impacted his career. It’s infuriating to think T lost time due to such petty interference (OTOH, I could only finish the film on my third try, falling asleep in first two attempts! So she had a point)