What is Yan Ti's contribution to China's calligraphy?

From the perspective of visual perception, the fourth volume of An Introduction to Han Xi's Calligraphy, Yunbi Volume, written by Ge Shouzhi in Qing Dynasty mentioned: "tuxedo, Li Fa also". However, through the trip of "Yan", it made new use of it, focusing on the careful imitation of the dovetail potential, thus surpassing the ancients and forming a new set of dovetail bodies. Therefore, Ma Yongan's calligraphy art not only imitates and draws lessons from the dynamic beauty of willow leaves and bamboo leaves, but also conforms to the new structure, brushwork and modeling. In the history of China's calligraphy, it is indeed an innovative move. His calligraphy style is steady and elegant, with vigorous brushwork, smooth trend and much luck. It not only presents the beauty of the calligrapher's temperament, but also loses its statutes, high interest and pure lines. The overall aesthetic feeling of the art of "Ma Shu" is horizontal. Looking up and closing the front shows its beauty and strength, just like a bird entering the forest, jumping like a dragon, fluttering like a cloud and blowing heartily. As Ma Yongan said in his book: "Painting and calligraphy draw books in painting and calligraphy, and painting and calligraphy draw pictures in books". Picturesque words, like books, have a sense of "painting and calligraphy in one". This creative way and aesthetic taste is exactly what Ma Yong 'an has been advocating for many years. It requires calligraphers to have comprehensive theoretical knowledge, artistic accomplishment, creative experience and acquired sensitivity to artistic works, and through hard study and study, combined with the aesthetic characteristics and social values of the current public, so as to integrate several calligraphy artistic styles and show brand-new formal beauty and artistic connotation. In this way, the calligrapher's knowledge, interest, ability, style and artistic level will be unabashedly expressed through his calligraphy works, which is an important channel for calligraphers to express their feelings.