<s>[INST] Let's imagine that we are writers trying to create a new and imaginative fantasy world. Let's start with a basic premise:
our fantasy world is set in a realm called Aethoria, which exists on the inside of a hollow, spherical planet. Think of it as the surface of a giant sphere, like the inner surface of a shell. Gravity pulls everything towards the innermost core, so things would fall "up" towards the center of the sphere.

How do we go about building this world?[/INST]