Without the ability of a great god, I can't think from the times and the director, just some subjective thoughts, and the vernacular is easy to understand.
There must be something wrong with Anna's spirit (of course, including her reaction after being taken by a cheating man), she is fragile and sensitive, and it is easy to force herself to death. She is well aware of the mistake of cheating, but she can't help approaching and even reaching madness. So my understanding is that the tentacle monster belongs to the virtual state of fantasy in her heart, and the position it is in is the derailment position of the two sisters. The movie just materializes this thing and connects it with real life, so that what happens after that is more logical. Why materialize monsters, because it is difficult to express a person's inner world with a camera, and it will be easier to understand when you bring them all into subjective thoughts and materialize them. She had sex with the monster, fell into it, and even betrayed, murdered, and went crazy in order to protect it. This is obsession. Knowing the mistake but unable to resist, Anna's husband did something similar. Finally, a man similar to Mark appeared, it should be that the tentacle monster has become more and more human-like. Anna still loves Mark, but she can't resist the joy that cheating, the tentacle, brings her. In order to alleviate the pain of loyalty in her heart, she imagines the tentacle as her husband to achieve relief. Everything I see is subjective, so I deliberately checked some information, but no one can make a complete interpretation of this movie, and I guess I can't understand it. My understanding is also limited to this, a thousand people have a thousand Hamlet in their hearts. Although I don't fully understand it, such as the teacher who is similar to Anna, who is the last knock on the door, but I don't think it's a bad movie [shrug]
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