The CAIRN database houses over 25 collections of illustrations which amount to a total of 22,000 images. Most images belong to books originally published in the early modern period, although many collections also include medieval and modern imagery as well. The illustrations have various foci, and mostly belong to sources from the Americas as well as Europe, although they also include a few from Asia. The images belong to illustrated literary texts such as La Celestina, Don Quijote, and Gulliver’s Travels, and other genres such as travelers’ diaries, novels of manners and conduct, and maps. Some collections feature illustrations in colour, some are in gray scale, and some collections offer both. The sources for these illustrations are scanned PDFs of the books undertaken by libraries across the world.
The number of images belonging to each collection in part correlates to the source’s popularity and impact. The Don Quijote collection, for instance, spans over 15 editions, 7 languages, and contains over 648 images, while Ovid’s Metamorphoses collection contains 10 editions prepared in four languages and 756 images.