I had a great time with version 1.0 a couple of years ago when it first came out. The author invites the reader to contribute right on the page of this self-professed "unbook": adding, doodling, revising, and so I did just that. Every page was a co-creative adventure in exploration of the visual.
The author also invites readers to send their images back to the author for further editions. I failed to send mine back in because I loved my co creations so much.
Thanks Dave for a great time. Someday,maybe, I'll send it back to you with all my additions. But for now, I think I'll just hold on!