Inverted Physics

The various Bubble-worlds of InnerSpace function under augmented gravity due to their Inverted Physics.

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.