The Mind Is a Collection is a born-digital museum of early modern cognitive models. For the last decade or so, I have been studying the spaces in which the philosophies of the British Enlightenment were thought, penned, or put into practice. One outcome of this research is a book, The Mind Is a Collection: Case Studies in Eighteenth Century Thought (Penn, 2015). But this book was all along imagined as the catalogue of a museum, a collection of the things that people used to make sense of mental processes. This is that museum.