The Denver Derrick at the Denver Central Library is a remarkable structure. The 42 ft. tall octagonal tower, with its canted posts, sits in the center of the circular Western Reading Room. Architect Michael Graves wanted a centerpiece for the building reminiscent of Western images (look closely to see a wagon wheel balanced on an oil derrick.) Bensonwood's Beam Team assembled the 12 in. square posts inside a chaotic construction site in close quarters, with just 1-3/8 in. to spare.