CONCEPT
Commonplace Book
The central information-management technology of the early modern period — a personal knowledge architecture constructed through selection, organization, and generative use, and the conceptual ancestor of contemporary AI curation.
A commonplace book is a personal notebook in which a scholar compiled excerpts from her reading, organized under topical headings for later retrieval and use. The practice developed in classical antiquity, was codified during the Renaissance humanist pedagogical tradition, and reached its most elaborate theoretical expression in John Locke's 1685 Méthode nouvelle de dresser des recueils. Ann Blair's research has established that the commonplace book was not merely a filing system but an epistemological practice — a way of knowing that shaped the knowledge it produced. The scholar who kept one was constructing, through cumulative acts of iudicium, a personal intellectual architecture that functioned as an amplifier of her own thinking and a resource for the production of new work.
In The You On AI Field Guide
Blair identifies three features that distinguish commonplace book practice from mere note-taking. The practice was selective: the scholar did not copy everything but chose what her judgment identified as valuable for her purposes. The practice