Introduction to Cave 21-45: The Western Yungang Grottoes include Cave 21 to 45 in the western part of Yungang Grottoes, as well as some unnumbered small caves and niches. Most of them are works produced after the 18th year of Taihe (494) in the Northern Wei Dynasty. It is characterized by many ungrouped caves, many small and medium-sized caves, and many small niches carved as supplements. Most of the statues are thin and clear, with overlapping pleats on the lower part of the clothing pattern, elegant and beautiful expressions, and elegant and free flying sky in the caisson. They have a strong Chinese style and are very close to the sculptures of the "Longmen Period". Among them, the relief sculpture of "The God of Music" on the north wall of Cave 38 is an image material for studying the miscellaneous actors of the Northern Wei Dynasty. The five-story tower column in the center of Cave 39 has five bays and six columns on each side of the tower. The brackets on the column heads support the eaves. , the balance seat, each floor is smaller in width and height than the lower floor. It is steady and graceful. It is an important material for studying early tower construction. The overall layout of Cave 40 cleverly uses decorative art to make the cave format and composition both regular and varied, which improves the style of grotto art.