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I think there is enough background knowledge and marital tension to make the wife a round character. We can clearly feel her stress over her husband's detachment and Robert's visit to the house. Robert is a bit of an enigma. I think there is more to robert than just being a flat character. Robert is a man interested in travel and "learning new things." An old friend of the narrator's wife, and still grieving from his wife Beulah's death. He has a spiritual side and helps the narrator experience a spiritual epiphany when they draw the cathedral together.