A space filling array in a 7- directional coordinate system. The major cells are polar
zonohedra with 42 facets. They connect in chains at their polar vertices, with each shared
vertex also surrounded by 14 hexahedral cells. Here is shown a ring of 7 major cells
surrounding the axis of symmetry, connected to one of the central major cells by hexahedra.
All of the space between major cells can be filled with minor cells whose edges are each unit
lengths deawn from the coordinate system.