Polished concrete serves as the anchor for the Oldknow Bookcase Lamp, which will quickly become a luminous addition to a library, a home office or a study. The wrought iron base and stem of this dual-purpose accent piece has been treated to an aged steel finish to bring out the dark stippling in the concrete. Topped with an off-white linen shade, were betting this lamp, at 16 inches tall, will be irresistible to bibliophiles.