What ancient poems describe "hard pen calligraphy"?

1. At Helen's cabin

Wang Zhihuan

The sun sets slowly near the western hills, and the Yellow River flows into the East China Sea.

By going up one flight of stairs, look further.

2. "Summer quatrains"

Li Qingzhao

Live and be a man among men; Die and become the soul in the soul.

Today, people still miss Xiang Yu because he refused to live and returned to the East.

3. Look at Lushan Waterfall

Lipper

The purple mist is illuminated by sunlight, and the waterfall hangs in front of the mountain.

On the high cliff, it seems to be thousands of feet high, which makes people think that the Milky Way has fallen from heaven to earth.