Oculus (architecture)
Circular opening in the center of a dome or in a wall / From Wikipedia, the free encyclopedia
"Oculi" redirects here. For the third Sunday in Lent, see Oculi Sunday.
An oculus (from Latin oculus 'eye'; pl.: oculi) is a circular opening in the center of a dome or in a wall. Originating in antiquity, it is a feature of Byzantine and Neoclassical architecture. It is also known as an œil-de-bœuf from the French, or simply a "bull's-eye".[2]