One of my favorite purchases from recent memory. I bought the PDF, just to read it because the reviews said it would generate new ideas, then after a half day consuming all this book had to offer I went and got the POD. Without a doubt what is presented here is presented in such a unique perspective that you can't help but feel your head begin to split with all the ideas this book is going to generate. This is truly a top notch book that goes beyond most other books in its worldbuilding and ideas. I'm happy to have found this book, and I have to applaud the authors for their work. I wish more books were as brilliant as this one.