Yet Another Secret Compartment Book

I had an old text book lying around and had a blade in my hand and realized what 1+1 equals, then made this. It has a fairly large space and i used masking tape to bind the inside and glue for the edges. This is the third and largest book I've ever been bored enough to make. I think it turned out well, and who would ever willingly pick up a history text for leisurly reading?!?