Proverbia doesn't just educate, they also collect proverbs. This series of books are just samples of hypothetical larger publications. Each book includes two illustrations with tipped-in vellum sheets before each one. The vellum pages feature the proverb the image illustrates, and turning the page reveals more information/imagery. This fits with the idea that proverbs are multi-layered and that studying proverbs creates a sense of discovery in the reader.