The endless shelves of books in the Midnight Library symbolize the countless lessons to be learned in Nora’s alternate lives as well as the unavoidable similarities among them. Each book in the library (except for the Book of Regrets) is a story; each one gives an account of a different path that Nora’s life could have taken if she had done things differently. The books literally transport Nora to her alternate lives, but they also serve as a symbolic representation of those lives. Books can represent knowledge, wisdom, and lessons to be learned from the stories in their pages. So, when Nora experiences a new life by opening one of the library’s books, she’s simply learning something new about her life and life in general, almost like she would in an ordinary library. In a more "meta" sense, this also reminds the reader that they’re experiencing Nora’s lives and learning with her by reading a book themselves.
There’s always more to learn, so the books stretch on forever, but they’re all bound by the same limitations despite continuing infinitely. All of the books in the Midnight Library are varying shades of green (some lighter and some darker). This is a visual representation of how Nora’s lives vary in many ways, but all of them are still fundamentally Nora’s lives. Nora can no more escape from herself than she can find a book in the Midnight Library that’s red or blue. No matter which version of reality she visits, she’s always herself, imperfections and all.
Library Books Quotes in The Midnight Library
Chapter 7 Quotes
The books were everywhere, on shelves so thin they might as well have been invisible. The books were all green. Greens of multifarious shades. Some of these volumes were a murky swamp green, some a bright and light chartreuse, some a bold emerald and others the verdant shade of summer lawns.

