I also love a great origin story. Growing up, I read a lot of comic books and my absolute favorite stories were the origin stories of heroes and villains. Like Chad noted above, Japan's origin story gave insight into how and why Japan is the way that it is. Clay, you brought up a great question about why are these stories retold and it got me to thinking, "Are origin stories always told the same way or are they often shaped, edited, and revised so the new origin story will present different values and ethics that the characters will possess?"