Made of borosilicate glass, the Bocci sconce is a "cast glass half sphere with a frosted cylindrical void that houses a 10 watt xenon or halogen lamp. The light interacts with the imperfections and bubbles of the cast glass to make a visually rich halo of light. Cast glass is an organic process, imperfect by nature, so each piece is unique." The Bocci 14 Series Wall Sconce; $236 at Y Lighting.