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Chapter 2: Building Games / Building Worlds / The World / Planetary Basics

Shape

Source GM Core pg. 134
In a fantasy setting, the shape of your world need not be spherical as governed by the laws of physics. It could be any shape you desire, and it might not be a planet at all!

Globe: Barring some catastrophe, worlds in our reality are roughly spherical due to the influence of gravity.

Hollow World: What if the landmasses and civilizations of a world existed on the inner surface of a hollow sphere? In such a world, the horizon would climb upwards, permitting creatures to see landmarks at extraordinary distances. Light might emanate from a sun-like orb in the world's center, from various other natural or magical sources, or not at all.

Irregular: What if your world is flat, a toroid, or shaped into a cylinder, cube, or other polyhedron? What if it's something even stranger? With such an unusual shape, you may need to decide how gravity, atmosphere, and other details function.