On the Physics of hollow earth. Usually, applying mainstream physics, it the hollow sphere would collapse under its own gravity.
However try to imagine it like the legends of hollow earth state that the earth has an inner sun.
Now this inner sun creates a magnetic field (the very one we use for compasses). Now imagine that like its rumored that gravity doesnt exist, but that its actually another aspect of the electromagnetism, namely the van der waals forces relating the aspect of gravity to magnetic fields, like in example the one of the inner sun. This inner sun could create something similar to the Hutchison effect
https://www.youtube.com/watch?v=xeUgDJc6AWEtl;dw: via electromagnatic vibrations you can let nonmagnetic/metallic/conductive materials levitate.
If this happens to be the case the crust may alignes itself with everything on it in the shape of a toroid around the inner sun present in legends about the inner earth, "locking" everything in the field of influence onto the position of the crust in a toroid shape resulting in a spehrical object with polar openings like the standard hollow earth model
furthermore if this is the basis of gravity all that is needed to overcome gravity should be electromagnetism
One of my favorite theories (for which i have no evidence what so ever though) is that the build up of the world is like this:
We have our planet, and around us the entire universe. However when you go through one of the polar openings the inside becomes the outside, exposing you to a complete other world which has our world and universe inside theirs instead. Metaphysically it would be a bunch of flat planes stacked upon another, making you rise up a world/dimension/realm going through one pole, and down through the other one, where the planes then are curved around themselves making the earth round.
