The spear and arrows are identified with the beams of the sun and moon.
On their level tops the beams supporting the platforms were laid and fastened by wooden pins, or inserted in mortices cut in the heads of the piles.
The interior arrangement of wall columns, horizontal beams and cornice bracketing corresponds with that on the outside.
The ceilings have the representation of beams and rafters cut in the rock.
In the former the main supporting member or members may be an arch ring or arched ribs, suspension chains or ropes, or a pair of girders, beams or trusses.