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Originally posted by Rodman1_r2:
To me, the most powerful scene was the very last one in Part I. After Michael tells Kay that he didn't kill Carlo, and as she leaves, and begins folding clothes, she looks through the doorway and sees Michael's caporegimes and other deputies pledging their loyalty to him, while at the same time, a bodyguard (I think it's Al Neri) closes the door.

To me, that scene is the epitome of the entire idea of the Mafia, as well as symbolically the image of the Mafia. Keeping the public unaware of their doings (with the public being Kay), and rules of code and loyalty within the Mafia.
I agree that this is one of the most powerful images, except if you look at the scene closer... we the public are not left in the dark with Kay. The shot changes and we are in the room with Michael. The audiene has been allowed to enter Michael's world. The only one left in the dark is Kay. For that reason I find it beautiful.