What do 500 Days of Summer, Midnight in Paris, La La Land, and Her have in common?

This isn't a set up for a joke, I'd honestly like to know. All four films have stuck with me, haunted me, made me feel excited, dizzy, melancholic. I can't stop thinking about them, and just the thought of seeing them again makes me very emotional. I've seen them each a handful of tiems, and I feel like there's a common theme here that can help me learn about myself. They're probably my favorite films ever because they make me feel, but I can't really put my nose on what it is I'm feeling. I'm hoping some cinemaphiles may be able to explore their common themes and help me identify what is exactly is it hitting me so hard.

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