Three people have spent the past three years building a video game that works like a pop-up book. Launching today for iPad, Tengami is a beautiful adventure that looks like a cross between a childrens pop-up book and Japanese origami. A pop-up book is essentially a toy book, says co-developer Jennifer Schneidereit, and we wondered what would happen if we translated that into a video game. Theres not much action in Tengami.