Question: what was the purpose of the easter island statues
[{'answer': 'symbols of authority and power', 'provenance': [{'wikipedia_id': '455038', 'title': 'Moai', 'start_paragraph_id': 13, 'start_character': 58, 'end_paragraph_id': 13, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Description.:Symbolism.\n'}]}, {'answer': 'repositories of sacred spirit', 'provenance': [{'wikipedia_id': '455038', 'title': 'Moai', 'start_paragraph_id': 13, 'start_character': 210, 'end_paragraph_id': 13, 'end_character': 239, 'bleu_score': 1.0, 'section': 'Section::::Description.:Symbolism.\n'}]}]