Washington, DC. Heliostat, glass, fabric, stainless steel. Glass cone: 120 ft. high, 72” diameter at top, 18” diameter at base. photo ©Paul Warchol.

This solar light pipe in a Washington DC law firm uses a heliostat to redirect sunlight through the center of a prismatic glass cone. The work brings daylight to an almost-dark atrium that is 140’ deep, 60’ long and 8’ across.