The entire spirit of this book project reflects the editors’ shared belief in the power of an open and inclusive community, of learning, and of collaboration toward innovation. From the outset, the editors knew that this book would be an open project in its own right. It had to be published openly (to practice what we preach), and it would serve as an opportunity to learn the process of creating an open book from start to finish, including, for example, developing review criteria that would ensure rigor, diversity, inclusion, and ingenuity while drawing from the open community to involve both novice and expert OP practitioners both as authors and readers.