Does anyone know about this? Just sharing

I've studied the flat earth theories (in conjunction with studying Tartaria & other not-so-ancient advanced civilizations), & I've also run across some items that talk about the earth "realm" & how what we think is the entire world is really only a small part of it

Fascinating either way, and I think that there is something like a firmament which exists

Because the info isn't widely available you have to sort & sift & put things together a piece at a time