A column structure in accordance 7 wherein the polygonal perimeter of {TAIL ~ the column} is {HEAD ~ a regular equiangular and equilateral polygon} 
A column structure in accordance 7 wherein the polygonal perimeter of { TAIL ~ the column } is { HEAD ~ a regular equiangular and equilateral polygon }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD