"Oil is the equivalent of what used to be gold. A luxury that we cannot eat," explained director Frank Castorf in an interview, outlining one of the key ideas behind his production of the Ring at Bayreuth. In the final part of the tetralogy, the wild journey ventures to the Buna chemical plants in Schkopau and to New York's Wall Street, among other places. Inspired by the aesthetic of Hollywood B movies, the production was first met with disapproval but grew to gain many supporters over the year...