1. Style features: Fang Bi is the main product of Longmen, which is simple, round, majestic and powerful, with square fonts and little change in stroke thickness, giving people a sense of simplicity and solemnity. On the other hand, Tang Kai is characterized by rigorous structure, rigorous statutes, clear brushwork and strong bones. Its shape is rectangular, horizontal and vertical, symmetrical and balanced, and vigorous, giving people a dignified and beautiful, steady and heavy feeling.
2. Historical background: The four products of Longmen are rubbings of Longmen Grottoes, which reflect the book style and aesthetic orientation of the literati class in the Northern Wei Dynasty and are one of the important heritages in the history of Chinese calligraphy. Tang Kai originated in the Tang Dynasty and was created by Ou Yangxun and others. It represents the highest level of calligraphy in the Tang Dynasty and is one of the important schools in the history of calligraphy in China.
3. Artistic value: As the calligraphy treasures of the Northern Wei Dynasty, Longmen Sipin has unique historical and cultural value and is one of the important materials for studying the history of Chinese calligraphy. On the other hand, Tang Kai represented the highest level of calligraphy in the Tang Dynasty. Its unique artistic style and characteristics have had a far-reaching impact on later calligraphy, and it is also one of the basic fonts for modern Chinese character writing.