As you should be aware, the new perimeters are largely where we had been able to walk out to; to the edge of the island. But now the barrier itself seems to present ... an illusion, of there being more land outside of it, as opposed to just -- sky, as we had observed. It seems as if it should go out farther than it already has. And that ... movement, that we noticed, that we couldn't quite see. That's still out there, as well.

They weren't especially common in our world, either. Yuan can provide a better explanation, to be honest.