The Peek-O-Book is a close relative of the Snap-O-Lantern. The book occasionally opens and peeks out with its LED eyes before snapping shut again to look like a normal book on a shelf.
A compartment is cut into the pages of the book and the circuitry is hidden inside.
The orange LED eyes are affixed to a small piece of wood which is then glued to the cover of the book so that they just fit inside the compartment. The rest of the electronics are nestled inside the compartment.
We made the Peek-O-Book for The Art of Tinkering book release party at the Exploratorium Afterdark event last week. Many of the tinkerers featured in the book were invited to hack a copy of the book. The cabinets in the Tinkering studio were packed full of hacked books and projects from the book. You can see pictures of some of the other hacked books in our photo set.