The Clayton Borders, formerly Library Ltd., offers a huge selection of children's titles, from educational books on dinosaurs, the human skeleton and Japanese for Children to Dr. Seuss, Stuart Little and 20,000 Leagues Under the Sea. The real draw is the giant storybook castle that surrounds the children's area, with a series of funhouse mirrors housed inside a turret. There are other entertaining diversions, such as a wooden train set and a easel with sticky felt characters, as well as miniature tables and chairs that encourage kids to sit down and stay a while. The music selection is extensive, with tapes and CDs featuring everything from Mozart for babies to Schoolhouse Rock. Too bad this location, on a prime spot of Clayton real estate, is slated to close in September 2001 as Borders moves to the Brentwood Town Center, across the street from the Brentwood Promenade. For fans of the castle, more bad news: Although the design of the new store is still in the works, the castle probably won't be part of it.