Sixty feet above the Occoquan River in Prince William County, what the judges called “a modern still life” interacts with the texture, light, and colors of its five-acre site. Robert M. Gurney set a corrugated-metal trapezoid along the wooded river view. An elliptical section in oxidized steel panels is meant to mirror the hues of the ground and autumn leaves; it contains a fireplace and an oculus whose light moves around the living room. Where the pieces intersect, in the main public areas upstairs, the plan is open; rooms are defined by height. “The strong juxtaposition of volumes and materials makes a memorable presence in the woods,” the jury said. The contractor was Chandler Construction of Clifton.