Interior view of the large oculus on the apse wall of of the 13th-century Duomo di Siena (Siena Cathedral)

Interior view of the large oculus on the apse wall of of the 13th-century Duomo di Siena (Italy) | Photo by Mike Hudak

16 Oct 2016, 17:15. Interior view of the large “oculus” on the apse wall of of the 13th-century Duomo di Siena (Siena Cathedral). The green coloration of the encompassing stone is an artifact of the digital photographic process by which I strove to retain details of the architecture without over-exposing the stained-glass window.