Please analyze the characteristics of Yan Zhenqing's calligraphy from Magu Mountain Xiantan and Jingjinbei.

The biggest feature of Yan Zhenqing's works is: dark turn. Or turn while walking-you need to screw the pipe counterclockwise, especially for slender horizontal paintings and heavy vertical paintings. The advantage of this brushwork is naturalness. His strokes are all done in a natural state without any discomfort. The Diligence Monument is a model.