2. What is the example of metafiction ? How do we know this book knows it’s a book?

Basically metafiction uses techniques to draw attention to itself as a work of art, while exposing the "truth" of a story. Maus, as a graphic novel, is both an example of art as well as historical fiction. Throughout Maus Artie is struggling to write the very book we are reading hence the book knows it's a book.