Located behind the Wenhua Hall, The Belvedere of Literary Profundity (Wenyuan Library) stands out within the Forbidden City for its distinctive architectural features. While most structures in the Forbidden City are adorned with yellow glazed tiles symbolizing imperial authority, the Wenyuan Library is uniquely roofed with black tiles. This color choice symbolizes water, aligning with the traditional Chinese belief that water counters fire, thereby serving as a protective measure against potential fires.
 

As the imperial library during the Qing Dynasty, the Wenyuan Library was specifically constructed under Emperor Qianlong's directive to house the Siku Quanshu, the most extensive encyclopedia in China's feudal history. The library’s design includes six rooms, diverging from the typical odd-numbered room configurations—such as 9, 7, or 5—found in other Forbidden City palaces. The number six is traditionally associated with water in Chinese culture, further emphasizing the intent to protect the structure from fire hazards.