Her
Unrelated to the actual theme of the movie, but this movie reminds me of when you're a phone call with someone you aren't on good terms with, but someone you still really care about, and you're dreading that they're going to hang up at any second, and then that worry makes you wonder that if they did hang up, when would you be able to hear their voice again?
Overall, this movie was extremely touching, beautiful, and quite funny at times. Definitely gets a 10/10 from me.