Bubble-worlds

The Bubble-worlds are spheres of water and earth, all functioning under Inverted Physics, in the world of InnerSpace.

Summary
The Bubble-worlds are a series of interconnect, inverted spheres. These spheres have an interior world of once-inhabited islands surrounded by water. Because gravity in this world of Inverted Physics pulls water outwards to the edges, the worlds are dry while the edges are aquatic, neccesitating both a Diving Mode and Flight Mode for The Cartographer's Plane.