请问孔明灯是什么？
孔明灯相传由诸葛孔明发明。[{'character': '孔', 'pinyin': 'kong3', 'highest pitch': 14.08, 'lowest pitch': 7.62, 'duration': 0.28, 'prosody hierarchy': 'null'}, {'character': '明', 'pinyin': 'ming2', 'highest pitch': 9.24, 'lowest pitch': 7.36, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '灯', 'pinyin': 'deng1', 'highest pitch': 10.06, 'lowest pitch': 8.6, 'duration': 0.3, 'prosody hierarchy': '#2'}, {'character': '相', 'pinyin': 'xiang1', 'highest pitch': 9.86, 'lowest pitch': 8.9, 'duration': 0.29, 'prosody hierarchy': 'null'}, {'character': '传', 'pinyin': 'chuan2', 'highest pitch': 8.52, 'lowest pitch': 6.72, 'duration': 0.3, 'prosody hierarchy': '#1'}, {'character': '由', 'pinyin': 'iou2', 'highest pitch': 8.94, 'lowest pitch': 6.72, 'duration': 0.29, 'prosody hierarchy': '#1'}, {'character': '诸', 'pinyin': 'zhu1', 'highest pitch': 11.04, 'lowest pitch': 10.57, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '葛', 'pinyin': 'ge2', 'highest pitch': 10.39, 'lowest pitch': 8.97, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '孔', 'pinyin': 'kong3', 'highest pitch': 14.08, 'lowest pitch': 4.8, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '明', 'pinyin': 'ming2', 'highest pitch': 9.24, 'lowest pitch': 4.8, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '发', 'pinyin': 'fa1', 'highest pitch': 9.24, 'lowest pitch': 6.03, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '明', 'pinyin': 'ming2', 'highest pitch': 9.24, 'lowest pitch': 4.79, 'duration': 0.35, 'prosody hierarchy': '#4'}]