#18 - Very nice. I like the progressive, stylish typography. The visual is also stronger, evocative of a helix. One idea about the mark is to expand beyond just a printed textbook. Is there a small adjustment that can convey electronic distribution as well? We're making sure we're not a 'press' or anything that limits us to paper: many of our books will probably end up in digital formats, perhaps as eBooks, PDFs or on a Kindle.