What is an opening poem?

Poetry with Chinese characters (poems with Chinese characters) is written in the form of Chinese characters. According to the structural characteristics of Chinese characters, Chinese characters are divided into several words to form words, and the words are hidden. In the Qing Dynasty, Zhao Yi wrote a calligraphy poem: "Tiaoxi Collection in the Southern Song Dynasty" has a calligraphy poem:' The sun and the moon are bright and faint, the mountains are green, the stone skin is still firm, and the ancient wood is immortal. When can people come? If they want to travel thousands of miles, they always sing the yellow crane. People with lofty ideals have no heart. " "