You can use the bookshelf anytime.
You can choose a book.
You can borrow it and bring it back.
You can keep it and replace it by another book.
When you like the book so much that you want to keep it a longer time, you can. But when it is really so good, others should also be able to read it.
When you have many books at home that you would like to bring to the bookshelf, then do so. But please only as many that fit in the bookshelf.
When something is broken, please call the following phone number xxxxxxx.
Now, is that great concept or is that an absofuckinglutely amazing concept many cities should copy?