(Photo credit: Glyndebourne’s own official trailer highlights its festival as “No Ordinary Opera”. Certainly, the staging for “Tristan und Isolde” is far from ordinary, courtesy of a visually entrancing setting by Ronald Aeschlimann. The performers are basically encased in an elliptical vortex-type form of concentric circles, which I interpreted to be a depiction of some portal-like presence intended to illustrate {…}