The books we love offer a sketch of a whole universe that we secretly inhabit, and in which we desire the other person to assume a role. One of the conditions of happy romantic compatibility is, if not to have read the same books, to have read at least some books in common with the other person—which means, moreover, to have non-read the same books. From the beginning of the relationship, then, it is crucial to show that we can match the expectations of our beloved by making him or her sense the proximity of our inner libraries.