Question: what feature occupied the center of a roman domus
[{'answer': 'atrium', 'provenance': [{'wikipedia_id': '1317246', 'title': 'Atrium (architecture)', 'start_paragraph_id': 1, 'start_character': 20, 'end_paragraph_id': 1, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1317246', 'title': 'Atrium (architecture)', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 722, 'bleu_score': 0.983537688954433, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7748308361753780393}, 'section': 'Section::::Ancient atria.\n'}]}]