In this film, apart from Norman, I felt the "cleansing of sins" and "punishment" in the dark.
In the scene of Marion driving a car into a heavy rain, the swing of the wipers symbolizes the swing of the bayonet of fate. In a conversation with Norman Bates, she had already developed the idea of "returning that money for punishment."
And the shower in the bathroom, this scene I think has the meaning of sinful cleaning. It is not difficult for the audience to find that this is the first time she has shown a sincere smile.
In the 1950s, Hitchcock not only photographed the toilet, but gave a close-up. And the bathroom in the movie is covered with white tiles, simple decoration style, bright light. But Hitchcock associated it with violence, blood, murder, crime, etc., resulting in a strong contrast and shock. This detail also seems to imply that the subsequent development of the plot will be a little different than you think.
When we thought it was going to be a road battle royale, the heroine dies halfway through the film. The first half is a pure property crime, but the real murderer in the back threw a huge amount of property into the swamp without caring. There is a very sharp contrast here, which is embarrassing.
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