No, this is not to combat the bats, but is a fun type of book I learnt to make last week. The first photo shows the exploding book closed, on the right. The one on the left is a book made out of a CD cut in half (caution: CDs need to be heated with boiling water first before cutting to prevent pieces flying up into your eyes).
This is the exploding book opened up. You can make them out of contact sheets of photos printed out onto normal photocopy paper, or write things on them, decorate them (wish I could draw!), whatever you can dream up. They can be made in any size. I was always attracted to pop up books, even as an adult, and exploding books are a very basic kind of pop up book. Fun!
This is the CD book opened. It would be good for cards, or for decorating, writing poems in, etc.