Re: Dog Chases Tail, Tail Wags Dog
... Actually, some further thoughts since you brought up the Izzies (Izanami and Izanagi).
In my view, one of the central themes of the myth is that of creation and destruction. The spear, an obvious phallic symbol, can be used creatively or destructively. The episode you mention where Izanagi thrusts his spear into the primordial soup is one of creation. In this act, the world of form is conceived.
From there the myth goes on to illustrate which acts produce harmonious union and healthy offspring, and which acts generate imbalance and horror. I think there is some wonderful material to reveal how to do aikido. When is our waza really aiki, and when is it just an empty form, and when is it actually harmful?