What are the calligraphy features and characteristics of Tiaoxi Poetry and Shu Su Tie?

Tiaoxi Poems and Shu Sutie are Mi Fei's representative calligraphy works when he was 38 years old. The former is written on paper, which is beautiful and vigorous, while the latter is written on silk, which makes the brushwork thirsty and the brushwork between the pen tips wonderful. After Bird's middle age, more ink came down.