I have to thank one of our regulars for pointing out another detail visible in the new photos of the quad: There appear to be steps around the perimeter! In fact, I think these were part of what originally made me think there was tracery in the arches—in the overhead shot in COS, the steps are vaguely visible, but it’s not at all clear what they are. Anyway, here’s a small post showing off that fix. Thanks, Englanderish!
(As a bonus thank you, I’ve temporarily installed that artificial sun you requested. It does get dark down there in the original quad.)
I’ll wrap up this short post with another SS/GOF slider, partly to show another angle of the steps, and partly because I added a couple more flambeaux to the GOF version. This is the view you’d have with your window pressed up against the big window in the marble staircase tower.