… it would seem natural that older forms [media or technologies] are put to new uses and discover new roles. The book, for example, in our time has discovered many new functions that it never had fifty or a hundred years ago. It has become very powerfully directed toward teaching people how to learn other things besides books [e.g. how-to books], how to learn arts of many kinds. The book has taken on a vast new function as a means of informing people, directing people’s skills in many, many areas.