¶ Tetrahedron: Coordinate Symmetry
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Index Entry
Of “all the … symmetrical figures I find only the tetrahedron has an integrity of symmetry independent of local alterations. It is possible to receive changes in respect to one part or direction of the universe and not in the direction of the others and still have the symmetry of the whole. A tetrahedron has a strange property of coordinate symmetry that permits alterations locally without hurting the symmetrical coordination of the whole.”
