This is a wireframe 3D projection of the 4D three-sphere, consisting of its parallels (red), merideans (blue), and hypermerideans (green). This model is based on inverse geometry, so all of the lines are circles. The straight lines are circles with an infinite radius. Just as a sphere is a two-D surface defining a ball in three-D space, the three-sphere is a three-D surface defining a ball in four-D space.

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