So I gather that some people don't really 'get' Rin and her weirdness, which now makes sense to me. The following is most of a comment of mine that I thought might make alright content, and if you have any questions, please ask.
I accidentally did Rin's line, and yes, there were feels to be had, but the biggest thing for me was realizing that Hisao is a blind idiot. Prepare for a long rant that may or may not make sense, because I think I can explain exactly what's going on in Rin's head.
I first figured it out when I got a good look at her paintings in the gallery, and later when she said she was trying to paint her soul confirmed it. She is indeed inside her own world most of the time, not necessarily a fantasy like Hisao's books, but a detached world where everything is fine, where she can think about these crazy things for hours because they distract her from the harsh, uncomfortable world outside.
This world, and, by extension, herself, is completely insulated by what Hisao called a gap and what Pink Floyd called a Wall. This Wall or gap consists of insurmountable mental and emotional blocks. When asked to explain herself, she says she can't. That doesn't mean she doesn't know why, it means she literally cannot get her lungs and voicebox to connect to the well thought-out ideas in her mind. It isn't the choice of words anymore, it's the fact that she can't.
She also shuts down when yelled at. There are two memorable yellings-at toward the end of her story, and she's almost completely paralyzed by both. In fact, I think she's only able to speak after them because it helps move the plot along.
Her paintings. This is the big one, and the reason why I almost hate Hisao. Have you ever noticed that not a single on of her paintings gives off any kind of happy vibe? They're almost always contorted humanoids, seemingly in pain, on a hostile background. Don't get me wrong, they're great paintings, but without even being any kind of art critic I can see what they are, once seen as a whole: they're a colorful, drawn-out scream of terror, loneliness, and sadness.
I know how hard it is for other people to get (not trying to be arrogant here; I really don't know), but I have a good deal of personal experience with exactly this sort of thing, which is why I'm sure that I'm right about this. Anyway, I hope this helped at least a couple of people and that I haven't taken too much of your valuable time.
"Valuable time." This is FJ.