The differences between page and screen go beyond the simple tactile pleasures of good paper stock. To the human mind, a sequence of pages bound together into a physical object is very different from a flat screen that displays only a single “page” of information at a time. The physical presence of the printed pages, and the ability to flip back and forth through them, turns out to be important to the mind’s ability to navigate written works, particularly lengthy and complicated ones. We quickly develop a mental map of the contents of a printed text, as if its argument or story were a voyage unfolding through space. If you’ve ever picked up a book that you read long ago and discovered that your hands were able to locate a particular passage quickly, you’ve experienced this phenomenon. When we hold a physical publication in our hands, we also hold its contents in our mind.

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We were probably mistaken to think of words on screens as substitutes for words on paper. They seem to be different things, suited to different kinds of reading and providing different sorts of aesthetic and intellectual experiences. Some readers may continue to prefer print, others may develop a particular taste for the digital, and still others may happily switch back and forth between the two. This year in the

U.S.

, some 2 billion books and 350 million magazines will roll off the presses. Something tells me Cai Lun isn’t turning in his grave just yet.