ELI5: Explain Like I'm 5

Library of Babel

The Library of Babel is a pretend library that exists only in a book. It was created by Jorge Luis Borges, an author from a long time ago. In the pretend library, there are many books, but these books are different from the books you might see in a real library. Each book in this library is made up of letters and symbols that are put together in a way that doesn't make sense. So if you looked at these books, you wouldn't be able to read them because they don't say anything that makes sense.

But even though the books don't make sense, there are lots of them. In fact, there are so many books in this pretend library that it would take you a really long time to look at all of them. In fact, it would take longer than you've been alive! That's how many books there are.

And here's something even more amazing: even though the books don't make sense, somewhere in the library there is a book that has every possible combination of letters and symbols. That means that somewhere in the library there is a book that tells a story exactly like the one you're reading right now, and somewhere else in the library there is a book that tells a story about a purple elephant who likes to eat ice cream.

So even though the books in the Library of Babel might not make sense to us, they still contain an infinite number of stories and ideas. It's a very special pretend library, and it can help us imagine all the things that could be possible if we just use our imaginations.