Tracery is the intersection in various forms of the mullions in the head of a window or screen.
Tracery is the intersection in various forms of the mullions in the head of a window or screen.
Tracery is the intersection in various forms of the mullions in the head of a window or screen.
Tracery is the intersection in various forms of the mullions in the head of a window or screen.
A rose window from the Bishop's Palace at Southwark. Rose windows fitted with stained glass are common…
A fourteenth century spherical triangle viewed inside a church. The window is indented with a bottom…
An outside view of the spherical triangle from a church. The window has three rounded parts in a shape…