How did Huang Tingjian learn how to use ink when he paddled?

Hello, I'm glad to answer your question.

Huang Tingjian has been troubled by things that he can't write with a pen and his pen is dull for many years, so he took a boat across the Three Gorges that night and saw the boatmen leaning forward and backward rhythmically in a certain space, pushing out the paddles to save them, and going back and forth, in harmony with nature. Huang Tingjian realized how to use a pen naturally by the boatman's action of rocking the paddle.