[Confusion]

I don't agree hearing and balance are the same sensory organ. They are two separate organs, just very near each other and indeed resembling each other, which explains why they are near each other.

The thought I was expressing is that there seems to be no separate organ at all here and that seems unexpected to me. I would expect there to at least be something like a specialized region. Not just that the eye in general happens to also have this ability.