After all, it is the skeleton that forms the central structure throughout the body and provides the core structural form. (weckmethod.com)
It's based on the power of three — a triangle, the strongest structural form. (massimomarinoauthor.com)
A series of intimately scaled charcoal studies depicts birds, houses and trees as serial motifs, collapsing and reforming into grids and other structural forms. (galleriesnow.net)