At a sharp bend where the Chattanooga Choo Choo chugs along the Tennessee River, the Wheland Foundry, an abandoned industrial site, marks the south end of 13 miles of trails connecting downtown to the Riverpark. While plans are in motion for redevelopment, the City of Chattanooga commissioned Moonrise, a bulbous Buckminster Fuller–inspired pavilion, to serve as the trailhead. Its architect, Marc Fornes (a 2013 Design Vanguard), and his Brooklyn-based studio TheVeryMany specialize in large site-specific structures that blur the line between architecture and public art. Benefiting from the studio’s digital-fabrication research, Moonrise is a lightweight double-layer shell, a latticework of 4,409 custom 3-millimeter-thick aluminum strips. Since opening, the pavilion has been the meeting point for group runs and guided hikes, and hosts yoga, meditation, and sound-bathing sessions.