These six directional cubes will adhere to the center with a greater adherence or affinity than the eight corner cubes touching only on the corners. In addition each of these six directional cubes are squarely touching the central cube. These eight corner cubes may be designated UNE, USE, USW, UNW and DNE, DSW, DSW and DNW (U=up and D=down).

Figure 6.16 - Juxtaposed Corner Cubes (click to enlarge)