The skywalks were, according to Copp, a necessary part of that playground: "We had to get people across [Light Street], so we ran a skywalk." The traffic engineers wanted Light Street to be 11 lanes wide here. As northbound cars were split off on the spur to Calvert Street, the island that resulted was developed into a sort of refuge. "We needed a big mass to the south, something like a mountain, to block the sound and exposure to traffic," Copp says. "And if we ran water through it, that would quiet things down and mask noise even more. So we needed a fountain." At some point in the planning process, the skywalk, mountain, and fountain merged into a multilevel composition, with people and water flowing through in all directions. The design of this piece was given over, in the late 1970s, to Wallace, McHarg, Roberts, and Todd partner Thomas Todd, and construction was completed in 1982.