The Octavo

The Octavo is the Discworld’s origin story hiding in plain sight as a prop. Pratchett needed a reason his protagonist was a wizard who could not do magic, and the answer he found is better than the question: Rincewind’s head is already occupied. There is no room for the curriculum because one of the eight most powerful spells in the universe moved in first and will not take a hint.

What lifts it above a plot device is the characterisation of the book itself. Pratchett’s magical volumes are never inert — they are chained, they are watched, they are dangerous in the way a large animal is dangerous rather than the way a weapon is. The Unseen University Library is the Discworld’s best running joke precisely because it is staffed on the assumption that books want things.

Note the relationship to the Necronomicon and its shelf-mates. Lovecraft’s grimoire is terrifying because of what it contains. The Octavo is troublesome because of what it wants. That is a comic writer’s instinct and a much more useful one — it gives the librarians something to do.

On the readability rating. We learn what the Octavo is for and what one of its spells did to a student. Of the spells themselves we get nothing, which is just as well.