This schematic image, drawn by DBOX, imagines OWTC’s upper reaches. The outer steel structure supports the glass curtain wall, the mechanical systems housed at the top of the tower, and the spire. Above and below the three levels of One World Observatory are mechanical floors. The spire rests inside a rooftop well that screens cooling towers and other equipment. The communications ring is a curved truss structure that supports broadcasting equipment, lighting fixtures, and three window-washing rigs. The spire is a latticework structure, which resists wind forces, and is further anchored by cables. Circular platforms along its length provide maintenance access. A powerful lighting system inside the beacon illuminates the spire, which can be seen from a great distance.