Something very important and very weird is happening to the book right now: It’s shedding its papery corpus and transmigrating into a bodiless digital form, right before our eyes. We’re witnessing the bibliographical equivalent of the rapture. If anything we may be lowballing the weirdness of it all.

The last time a change of this magnitude occurred was circa 1450, when Johannes Gutenberg invented movable type. But if you go back further there’s a more helpful precedent for what’s going on. Starting in the first century A.D., Western readers discarded the scroll in favor of the codex — the bound book as we know it today.

In the classical world, the scroll was the book format of choice and the state of the art in information technology. Essentially it was a long, rolled-up piece of paper or parchment. To read a scroll you gradually unrolled it, exposing a bit of the text at a time; when you were done you had to roll it back up the right way, not unlike that other obsolete medium, the VHS tape. English is still littered with words left over from the scroll age. The first page of a scroll, which listed information about where it was made, was called the “protocol.” The reason books are sometimes called volumes is that the root of “volume” is volvere, to roll: to read a scroll, you revolved it.

Scrolls were the prestige format, used for important works only: sacred texts, legal documents, history, literature. To compile a shopping list or do their algebra, citizens of the ancient world wrote on wax-covered wooden tablets using the pointy end of a stick called a stylus. Tablets were for disposable text — the stylus also had a flat end, which you used to squash and scrape the wax flat when you were done. At some point someone had the very clever idea of stringing a few tablets together in a bundle. Eventually the bundled tablets were replaced with leaves of parchment and thus, probably, was born the codex. But nobody realized what a good idea it was until a very interesting group of people with some very radical ideas adopted it for their own purposes. Nowadays those people are known as Christians, and they used the codex as a way of distributing the Bible.