This book compares essays written by Max Bill, Jan Tschichold, and Paul Renner on their conflicting opinions on the fundamental nature of typography. Not only did I put their arguments into close proximity, but I included my own comments on their debate and covered up the parts of their arguments I found insignificant and irrelevant.
This hardcover book was perfect bound by hand and displays on its cover a stereogram. If you focus really hard, you might be able to read it.