To me, it has always appeared to have been cut and fashioned in such a way as to be able to be slotted, pointy end down, into something. Very much like a cap on top of a fence post in shape.
Is the Floating Stone the same stone as that of the ditch around it? I'm curious. I noticed the stone is disconnected from the foundation. Is it possible that the stone fell over? The stone seems to be symmetrical from the triangular portion. Ok, never mind. Your friend Taro(?) answered my question.
Idk if you've spotted it, but the cross-section of the 2 staircases shows the icon for lightening. The cross-section of the steps are painted white and follows the same pattern. I don't think that's an accident.