A guest informed me "This is Moses and the Burning Bush with a representation of the Virgin." I did not know the virgin might be seen by Moses, let alone in the burning bush. But on the web I found: "The spiritual meaning of the passage, however, is sometimes related to the divine maternity of Mary. Consider the interpretation of Saint Gregory of Nyssa, an extraordinary theologian and bishop of the fourth century. He states:

“What was prefigured at that time in the flame of the bush was openly manifested in the mystery of the Virgin, once an interval of time had passed. Just as on the mountain the bush burned but was not consumed, so also the Virgin gave birth to the light and was not corrupted. Nor should you consider the comparison to the bush to be embarrassing, for it prefigures the God-bearing body of the Virgin.” "