Culture is full of binary concepts. Good and evil. Male and female. Mind and body (or was that body and soul?). These binaries condense the world so far they erase people and their messy realities. I have angry gut reactions against the ubiquity of trying to split things in half. Tale of Tales' Sunset, then, is a small miracle. My evidence that stories formed around the number two don't have to be cheap.
Duality is at the heart of everything.