The publishing industry is fuelled by people who care more about having something to read, when they want and at the price they want, than about books as objects. The small, lightweight book, whether hardback or paperback, has ruled the roost for hundreds of years, above all because it was the right size. When the boffins come up with something that fits the hand as well as a Penguin or a pack of cards, that’s when their “iPod moment” will come.