This piece documents the process behind the creation of Holt's major public art installation, Dark Star Park, in Arlington, Virginia. The park, which features giant concrete spheres and pipes, allows the visitor to reconsider the experience of space, earth and sky within an urban context. It also serves as a kind of contemporary Stonehenge: once a year, on August 1 at 9:30 am, the shadows of the objects exactly align with outlines on the ground. Interviews with the artist, the architects, engine...