You will discover that this book can be:A secret message - tear out a page, write a note on it for a stranger, and leave it in a public place.A recording device - have everyone you contact today write their name in the book.An instrument - create as many sounds as you can using the book, like flipping the pages fast or slapping the cover.This Is Not a Book will engage readers by having them define everything a book can be by asking, ''If it''s not a book, what is it then?'' - with a kaleidoscope of possible answers.