For Italo Calvino (1923-1985), classics are those books that never finish saying what they have to say. They are books that we think we know, but that always provide something new, unexpected or original when we reread them. And that is the conviction that encourages Italo Calvino to comment on his classic books, according to his criterion that each one's classic is one that cannot be indifferent to you and that serves to define yourself in relation or in contrast to it. The reader discovers Italo Calvino's best readings. The result: a book that has become a classic.