This creates a local environment that favours certain orientations of nonspherical molecules. This produces anisotropic particles with nonspherical shapes including prisms, cubes, and rods. By contrast, a highly nonspherical solid, the hexahedron (cube) represents "earth". His doctoral dissertation was titled "Nonspherical Gravitational Collapse and Black Hole Uniqueness". While its wave function is spherical, the stable shape of the bubble is nonspherical.