What are the artistic features of Lu You's calligraphy?

Lu You is a calligrapher, calling himself "Zhang Dian in cursive script"; Learn yang feng from running script. More than ten ink and wash paintings of Lu You have been handed down from generation to generation, such as Bitter Cold Post, Poem Post of Huaicheng, Poem Post of Self-Writing and Poem Post of Qing Qiu. The 44-year-old Bitter Cold Post is long and graceful, with bold and graceful brushwork. Through its random inclination, we can still see that its calligraphy imitates Su Dongpo and Huang Tingjian, but it is more free and easy and pays more attention to the changes of strokes. Poem Sticking to Chengdu, written at the age of 58, is even more vigorous and powerful, and its strange and stubborn spirit is fully revealed in the natural free and easy.