
To state it simply:
Ecclesiastical Art is a genre covering any material or object which acts as a secondary instructional material, but also the objects and articles used in the rituals of the faith. These run the gamut from windows, doors, church furniture, paintings, sculpture to Thuribles, patens, bibles and sacred texts and so much more.
John's fascination with this began as a child growing up in the Catholic church but has also expanded to many other cultures, Faiths and traditions.