The moon is the mirror of man. In the vast moon, a person is a black hole, one has to turn inward. On Solaris, he would see hallucinations, but on the moon, he would only see another self. "Raising a glass to look at the bright moon, facing the shadows into three people" has since revealed infinite horror.
From a sci-fi perspective, the plot seems corny: multinational corporations make dozens of cloned employees to save costs. But from a human point of view, everything is shocking, even terrifying. You find yourself standing in front of another self, one of yourself is incinerated every three years, the world outside is today, and what you rely on for a living is a false memory. What a paradoxical and profound despair it is to fight with myself, chat with myself about memories that do not belong to me, and bury myself by myself. With the echo of the piano, it was so miserable and terrifying that the robot couldn't help but shed tears and put a comforting hand on Sam's shoulder. (Curry is very much like Hal, but the fate is completely opposite.) "I'm lonely." So the only friend is the other self. "I want to go home." But there is no home. In theory, he (they) have never been born on the blue planet above his head, but he still wants to go back, to the homeland he misses most, to the eternal lonely star of mankind.
The music is so powerful that it directly brings tears to my eyes. Did they live? Does it make sense that they only have three years to live? The answer is in Sam's mouth:
"We're not programmed. We're people."
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