The Book Binder is an item added by the Mystcraft mod.
The Book Binder is used to create Descriptive Books. If you place some Leather and some Paper inside of the Book Binder then you can create a Descriptive Book.
Item SlotsEditThe slot in Red is where you can rename your Descriptive Book. The slot in Blue is where you place your Leather (at least 1 Leather is required to create a Descriptive Book). The slot in Yellow is where you place your Paper, which will turn the Paper into Pages. (at least 1 Paper is required to create a Descriptive Book.) The slot in Green is where your Descriptive Book comes out after you've created it.
Note: Any Wood Planks will work.