English: The skew octagram 2{4} represents the 16-cell's two completely orthogonal great squares. The two squares are central polygons of the 16-cell which do not intersect at all, although they have the same center point. They are completely orthogonal and Clifford parallel. The 16-cell is the simplest regular polytope in which Clifford parallel central planes occur (they do not occur in 3 dimensional space).
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