Final answer:
In religious art and scripture, God has placed all things under Christ's feet, symbolizing Christ's authority over all creation. This is depicted visually through imagery such as Christ sitting on an orb and by his actions such as the humble washing of the apostles' feet.
Step-by-step explanation:
According to Christian theology, particularly as interpreted from Biblical scripture and represented in religious art, God has put all things under the feet of Christ. This is a metaphorical expression signifying that Jesus Christ has been given authority over everything in creation, which aligns with the depiction in religious artwork where Christ is often shown symbolically as having dominion over the cosmos, including an orb that represents the Earth. In the provided context, Beth observes that Christ is dressed royally in purple sitting on an orb, which visually signifies his kingly authority over the universe. Other artistic representations, like the one in the Hosios Loukas Monastery, focus on more humble actions of Christ, such as the washing of the apostles' feet, emphasizing his role as a servant-leader and teacher.