Design savant Lee Broom layers acid-yellow optical acrylic over white Carrara marble to form an archly glowing sphere diffuser for his sculptural table lamp. Set into the black Marquina marble base, the characteristic veins of the stone take on a new guise when viewed through the tinted acrylic. Out of the ordinary, to be sure, but it's the freewheeling British designer's way of giving this very classic material a playful twist.