It seems that everyone has a digital device for reading books. In fact, take a look around any train or bus and you'll see people reading—on smart phones and tablets. Of course, a tablet is easier to carry around than a dozen actual books, but something is lost when you read from a digital device. That something is the way the book feels in your hands, the ability to gauge by looking how far into the book you've gone. Even the smell of the paper and the sound the pages make when you turn them can't be duplicated on a digital device. Nothing beats a real book.
What is the author's main claim?