I should really stop lurking, huh?
Well, if you can think of something to ask of her that wouldn't expose the 'geist then go ahead, afterall, we're looking for information. But if not I think we're fine with what we've got.
Haven't had much time to give this as much thought as it needs. However, this is what I came up with.
As far as I understood from Suwako (God speech is always amazingly annoying to comprehend for me) poltergeists need people thinking and talking about them to be created, and to live. And as far as I can remember, when she stole the shadow of both the tree and the rock the sense of emptiness vanished for a awhile, that's probably because people started to think and talk about it, but as time went on, their desire to talk about such things vanished. And the feeling came back.
When she stole Bhava-agra's shadow, the feeling didn't vanish, I think that's because people are causing a stir about the islands falling, but not because SOMEONE made them fall. Or something like that. That's as far I could understand.
Anything wrong there? >_>''