Answer :
Given the context of Owen's presentation about medieval art and the mention of a 230 feet long embroidered cloth, he is likely to mention the following additional fact:
OB. It is an example of Opus Anglicanum.
Opus Anglicanum refers to a style of medieval English embroidery that was highly valued across Europe during the Middle Ages. The term translates to "English work" and is known for its intricate and detailed needlework. The fact that the cloth in question is over 230 feet long aligns with the elaborate nature of Opus Anglicanum, making it a likely association with such a remarkable piece of artwork.