Tracery is an architectural term used primarily to describe the stonework elements that support plain or stained glass in a Gothic window.
Blind tracery refers to ornamental work of interlaced and branching lines carved on solid walls.
There are many examples of each in the Quadrangle.
Images are courtesy of the University Secretariat. Click on images for enlargement.
Various uses of tracery in the Quadrangle:
Various uses of blind tracery in the Quadrangle:
These same tracery patterns have also been used on wooden doors, wooden and stone stairs and metal lanterns in the Quadrangle: