Question: where did the tradition of easter eggs originate
[{'answer': 'Mesopotamia', 'provenance': [{'wikipedia_id': '9324', 'title': 'Easter egg', 'start_paragraph_id': 1, 'start_character': 963, 'end_paragraph_id': 1, 'end_character': 974, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9324', 'title': 'Easter egg', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1272, 'bleu_score': 0.9384540870611481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8421369234177545597}, 'section': 'Section::::Abstract.'}]}]