 The Tower of Art is also the motif of the Ankh-Morpork Post Office one-dollar stamp.Like the Bodleian Library at Oxford, the UU Library features chained books – although at Oxford this is done to protect the books from the students, whereas at UU it is done to protect the students from the books.The high concentration of magical lore has warped the Library interior into a locus of "L-Space" where the concepts of distance and direction are only vaguely defined.