Final answer:
The terms 'subject' and 'proxy' in art and literature refer to the main theme or character and an entity acting on behalf of another, respectively; in the context of motherhood representation, the mother figure often symbolizes broader concepts.
Step-by-step explanation:
In the context provided, "Kristi is Michelle's mother," there's no explicit mention of a subject or proxy within the relationships described. However, considering the additional information given, this quotation pertains to discussions about artistic representations and the symbolic roles of motherhood in history and possibly religious studies. Therefore, in a broader sense, the term 'subject' could refer to the main person or theme in artwork or literature, while 'proxy' might be used figuratively to describe an entity that stands in or acts on behalf of another. In literary works like "Revolt of Mother" or in historical religious art featuring Mary and Christ, the mother figure often symbolizes larger concepts such as the church, compassion, or nurturing, thus serving as both a literal and figurative 'proxy' for these ideas.