We communicate through art with symbols that transcend the boundaries of time and culture. ~ Richard Clar
Did you know in medieval times as well as today, in sacred places nearly every detail in stained glass windows is considered highly representational? The images not only depict stories but the colors used have specific meaning as well.
Consider the lily. If you see this flower incorporated in a stained glass window it represents devotion and humility.
How about them apples? What do you suppose that type fruit might represent in a church window?