We visited the stained glass conservation program today.
On the left is a piece of stained glass that depicts one of Christ's ancestors. The glass was probably broken out of the window during the reformation. It appeared on the doorstep of the cathedral in the 1970s with a note that said, "This is yours." One small section of glass was protected on both sides by painted decoration, and from that, the stained glass experts could determine the exact color of the original glass. For demonstration purposes, the conservation studio made a reproduction of what it might have looked like originally. Conservators still can't determine where in the cathedral the face might have gone.
Demonstration of stained glass painting.