The back of the building is another work of art. …Both the glass and the stone are etched. “On the bottom is an image of the library from 1905. On the top is the Milky Way, a tribute to the planetarium,” says Bennett. “ And in the middle is Obert Tanner, who brings it all together.” The glass is covered with a dot-matrix image, but the stone is done with a brand-new process. &lquo;It was developed for this building and has never, ever been done on limestone before. We hoped it would work, but we couldn’t be more pleased with how it turned out.”