# Sphere

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A **sphere** is a possible finite Life universe in the form of a sphere. The simplest way to do this is to use an m × n rectangle with the top edge joined to the left edge and the bottom edge joined to the right edge. It is similar to a torus except that it has adjacent pairs of sides joined instead of opposite pairs. With this configuration, the top-left and bottom-right corner cells become the "poles" of the sphere which have themselves as three of their neighbors. The other two corner cells have only one of themselves as a neighbor.

The following LifeViewer demonstrates how diagonal and orthogonal spaceships travel in a toroidal universe.

(click above to open LifeViewer)RLE: here Plaintext: here |

## See also

## External links

- Sphere at Wikipedia

- Bounded grids at Golly's online help