Believe it or not, the library predates the understanding of monads as a mathematical concept! Though it can be argued it is an example of a functor (the library is mapped over two countries).
A library is just a manuscript depository in the category of lending institutions.
> Though it can be argued it is an example of a functor (the library is mapped over two countries).
Now that's a special kind of joke I can only find on HackerNews