Lea and Lionel take a trip to the thirteenth arrondissement of Paris to visit the new National Library of France, also called the François Mitterrand Library. The library is comprised of four book-shaped towers: the Tower of Time, the Tower of Laws, the Tower of Letters, and the Tower of Numbers.

The François Mitterrand Library, part of the Bibliothèque nationale de France (National Library of France), is comprised of four large towers in the shape of open books. Lea notes that most of the library's visitors are specialists in art, science, and architecture rather than students.