The dominating architectural element that is present in this design is most obviously the curved, metal-topped roof system. Engineered by Western Wood Structures, the curved roof system was created with 19 glulam frames with glulam purlins spaced 4 feet on center as secondary framing. The glulam beams, crafted by American Laminators, measure 8-¾ inches by 52-½ inches and arc 104 feet over the displays below. Each of the 757 roof purlins is unique as they all have a different skew and slope as the roof curves in two directions. Thin pieces of sanded plywood sheathing cover the roof in order to bend around the 17-foot radius of curvature. Waterproof rigid insulation and a metal roof complete the structure forming one of the largest wood moment frames in the world.