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The Palace Museum celebrates the late collector Zhang Boju's passion for ancient masterpieces. Wang Kaihao reports.

In 744 AD, Li Bai, a poet of the Tang Dynasty (618-907), climbed the Wangwu Mountain in today's Henan province. He wanted to meet one of his old friends, who lived in Yangtai Palace, a Taoist temple on that mountain. Unfortunately, when he arrived, Li found out that his friend had died. The poet then wrote the 25-character calligraphy piece - Ascending Mount Yangtai (Shang Yangtai Tie) - to convey his feelings for the departed.

Li, considered one of the best ancient Chinese poets, may have left numerous masterpieces behind, but this is the only known surviving calligraphy work inked by him.