original question: What type of binding did the books illustrated by [Le Nain] use?
answer: paperback
answer type: Book Binding.
auxiliary information: The three Le Nain brothers were painters in 17th-century France: Antoine Le Nain, Louis Le Nain, and Mathieu Le Nain. They produced genre works, portraits and portrait miniatures.
[Le Nain] illustrated books that were bound using what type of binding?