There is a scene in the novel in which the newly-fledged archeologist Karen Holt sees Katsuren castle for the first time.  Her guide tells her that coins and pottery from far away often turn up at the site.  This past September, the two most unusual finds ever turned up, for real.  One was a coin from Turkey’s golden age.  The other was a coin from ancient Rome.  I was thrilled to have this new corroboration of the real Katsuren’s place in the world centuries ago.

When the world is round, any point you choose can be the center around which events happen.