Clerestory.  A clerestory (pronounced and sometimes spelled “clearstory”) window is placed in the upper part of a house wall to allow light into the center of a high-ceilinged room.  Clerestory windows limit views into the house from the exterior, providing privacy, while still admitting daylight. Although clerestory windows have been used since ancient times, they became popular again in the mid-20th century. Sometimes, as in this house in the 6000 block of Crow’s Nest Lane, they are rectangular, but clerestory windows found in old churches might be arched, or those found in other mid-century homes might be angled to fit beneath a shed-roof or a butterfly-shaped roof. In modern-design houses of the 1950s and 1960s clerestory windows were even used on walls inside the house to allow the passage of natural light into interior rooms.