As Bob Stein saw it, the future of the new text started potentially with Jon Craig's study of early editions of Copernicus's "De Revolution" and the comments that its readers had left. These books are very rare (they were considered to be the unread books) and were shared between professors and their students. Because of this trade, a dialogue between the readers developed where the readers left comments to the comments, and this diologue became interesting enough to be studied itself.