In my opinion, Lars is a somewhat autistic, not good at interacting with people, but a very good-hearted person. I don't agree that he is a delusion that the doctor thinks in the movie, although it is undeniable that Lars is indeed delusional, he imagined a lot of things that the inflatable doll did not say. He completed the conversation between two people alone. This is his way of communication. Maybe he is a little awkward to communicate with people, but with inflatable dolls, he doesn't have to worry too much, she can't talk, she will only "say" what he wants. He cared about her, regarded her as his girlfriend, and later let her die. I think that the death of the inflatable doll actually shows that he has returned from that world. He feels the warmth of the real world and is no longer alone.
The other people in the movie are really amazing. His brothers and sisters-in-law, neighbors, doctors and colleagues all pretend to live in his world. Treat the inflatable doll as a real person, take her to play, take her to do her hairstyle, let her go to work, and let her go to parties. These people are all acting in a play, just so that the protagonist in the play is no longer alone. There is also a female colleague who has a crush on Lars, who also helped him a lot. They are all amazing. They are all very nice people. If people in this world can be as loving as the characters in the movie, then the world must be beautiful.
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