{HEAD ~ A plurality} of such containers can be stacked upon {TAIL ~ the upper side} of the geometrically indexing support structure, and can be extended both horizontally and vertically to construct a generally pyramidally shaped structure extending to a substantial vertical height 
stacked upon
{ HEAD ~ A plurality } of such containers can be stacked upon { TAIL ~ the upper side } of the geometrically indexing support structure , and can be extended both horizontally and vertically to construct a generally pyramidally shaped structure extending to a substantial vertical height
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH