2, the pen is full: the pen and ink are used very freely and fully. Describe calligraphy and poetry. The dragon and snake in the pen: the dragon and snake jumped into the pen. Describe the vigorous and free brushwork of calligraphy. Write to the conductor, too.
3, flowing, writing like a cloud.
4, a pen, if the field of vision is out of control, the horse will fly and go; Another example is the dragon flying in the sky, which comes from nothingness and returns to nothingness. It is almost crazy and contains the aura of heaven and earth.