In the Harry Potter books, there's this place called the Room of Requirement. The way it works is you walk three times in front of this certain patch of wall at Hogwarts, thinking, like, I really need a coffee. And then suddenly in that room a coffee shop will appear. Or, I need a place to make my magic potion in secret, and then a room with all the ingredients for your magic potion will appear.
Libraries are like that. But in real life. That's what they do.
Thank You, Jessica.