The Spirit Ring is loosely based on Agricola's De re metallica, as well as on a folk tale, and the life of Benvenuto Cellini, as is explained in the Author's Notes that follow the last chapter.
Der Ring des Nibelungen | Holy Spirit | Spirit of St. Louis | Spirit | Ring of Honor | The Fellowship of the Ring | The Ring (magazine) | Smells Like Teen Spirit | Ring of Fire | The Ring | Ring | The Lord of the Rings: The Fellowship of the Ring | spirit | ''The Ring'' | Bull Ring, Birmingham | The Promise Ring | Spirit of the West | Ring 2 | Twin Ring Motegi | Ring Round the Moon | Independent Spirit Awards | E-Ring | Bull Ring | The Spirit Level: Why More Equal Societies Almost Always Do Better | Spirit (band) | Sheffield Inner Ring Road | Scarff ring | Ring of Fire (song) | Ring Lardner | One Ring |