Whose calligraphy works are the four ancient poems?

"Four Ancient Poems" is a calligraphy work created by Zhang Xu in the Tang Dynasty, with full strokes and no delicate and slippery strokes. The handwriting is ups and downs, moving and static, full of paper like a cloud, which is really the peak of cursive writing. Xuanhe Pu Shu, Inscription and Postscript of Continued Painting and Calligraphy, Shigutang Painting and Calligraphy Collection, etc.

Some of the four ancient poems are light, but they do not damage the fluency and conciseness of the whole work. As far as most lines are concerned, they have reached the state of being handy and interesting to write. In cursive script, it is a situation that Gao Xian and others never dreamed of. What really surprises people in the "four posts" is the word structure. Due to the influence of reading and appreciation habits, "word structure" has always been an unavoidable aspect of appreciation. Compared with Zhang Xu's other works, this work does not conform to his usual rules of word formation.