I just got a belated Mother's Day present last week from my Mom. Hon no Hon or Book of Imaginary Books by Junzo Terada. I've been wanting it since I spotted it on Last Gasp so my Mom ordered it for me and it was backordered and just came in. So worth the wait, it is the most beautiful book. I look through it everyday. The colors are addictive.
Jennifer in Japan clarifed that it is actually a book of book covers for imaginary books. So I guess there really is no The Octopus and the Drum. too bad!