It's not our rigidity that makes people compare us to rocks, vegetables, changelings, soulless automatons, and the like.
It's other people's inability to read us very well. They read nothing therefore they assume nothing's there. (And yet we're considered uniquely impaired in theory of mind for being unable to read them, even if some of us can read each other just as well as they can read each other.)
I don't mean this to be some kind of us-and-them thing, so if it looks like that it's only because I haven't been able to communicate the complexity of it. (I hate having to post disclaimers, but every experience here says that if I don't, someone will think I said something else.)
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams