Fig. 416.01 Tetrahedral Precession of Closest Packed
Spheres:
 Two pairs of sevenball, triangular sets of closest
packed spheres precess in 60 degree twist to
associate as the cube. This 14sphere cube is the minimum
structural cube which may be produced
by closestpacked spheres. Eight spheres will not closepack
as a cube and are utterly unstable.
 When two sets of two tangent balls are selfinterprecessed
into closest packing, a halfcircle inter
rotation effect occurs. The resulting figure is the
tetrahedron.
 The twofrequency (threespheretoanedge) squarecentered
tetrahedron may also be formed
through onequartercircle precessional action.
