The main difference between a game and a book (in the realm of the iPad) is that a game you pick up to play and a book you sit down to read. The expectation of what a thing is, determines how it’s going to be perceived and used (consumed). Games require more active input (gameplay) from the user in order to be entertaining. Books are more passive and there’s nothing wrong with that. On the contrary, trying to add interactivity where none is needed can distract from the content and the content is the book’s sole purpose. Books exist for content, where games exist for both content and gameplay.
That doesn’t mean that books on the iPad shouldn’t make use of the iPad’s full potential for interactivity, if it’s appropriate and helps the content be communicated better, or enriches it in a meaningful way. In most cases, however, it’s in the way.
Recognize your project and adapt accordingly. Don’t force a book in becoming a game. A book which could have been great as “just” a book, can make for an underwhelming game.0