Writers have kept notebooks since time immemorial. The auctorial equivalent to the artist’s sketchbook is the “commonplace book,” which can contain everything from newspaper clippings to grocery lists to attempts to capture those inspirational bolts out of the blue.

I’m sure that somewhere out there, there is a writer who is far more disciplined tha... See more

In collecting such a medley of ideas, Leonardo was following a practice that had become popular in Renaissance Italy of keeping a commonplace and sketch book, known as a zibaldone. But in their content, Leonardo’s were like nothing the world had ever, or has ever, seen. His notebooks have been rightly called “the most astonishing testament to the p

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