A cube is a concave, multi-layered, cube-shaped region of the Manifold where two tesseracts overlap. There are 40 cubes in the Manifold, with each measuring almost exactly 50 miles on a side, and each contains a human-habitable, terrestrial environment, though each is also unique in topology and environmental conditions.
For any given observer, gravity appears to point down towards the nearest cube layer face, with each face being a terrestrial crust anywhere from one to two miles thick on the inside surface of the cube. A given cube consists of several components:
- Two cube layers, with the one the observer is closest to appearing to be concave cube surrounding the observer and the other appearing to be a convex above the observer's head.
- An inflection layer, the space between the cube layers where neither appears concave or convex, instead taking on the appearance of two infinite planes of repeating terrain features.
- Twelve commissures, one for each face of each cube layer.
- Dimensional plane