Oculus. From the Latin for “eye,” oculus is the name for this round window and others of this shape. Alternate names for this feature are roundel (for its round shape) or bull’s eye (for obvious reasons). Oculi may be found in the sidewall of a building or at the top of a dome.

The oculus in this photograph allows a look out of an early 20th Century double in the 1400 block of Park Avenue. Oculi have been used as architectural features since at least the Renaissance.  Put on your glasses and look for an oculi near you.

Connie Zeigler is president and owner of C. Resources, Inc. Connie is a preservation consultant, writer and researcher.