Richard's paradox

Imagine there is a library that has all the books in the world. Now imagine that someone makes a list of all the books in that library. Let's call that list the "master list".

Now, because this library has ALL the books in the world, the master list must include every single book in that library. So, logically, the master list should be a book itself, right? After all, it contains all the books in the library.

But here's where it gets a bit confusing. If the master list is a book, it should be on the master list itself. However, if it is on the master list, then it's not a complete list anymore because it's missing itself. But if it's not on the master list, then it's still not a complete list because it's missing the master list.

This is Richard's paradox. It's a bit of a mind puzzle that doesn't really have a clear answer. But it shows us that sometimes things can get really confusing when we try to use logic to explain them.