What kind of brushwork is "painting sand with a cone"?

Metaphor is to use a pen. "Tapping sand" is one of the traditional techniques in China. It is a calligraphy term, which means the skill of using a pen. Its name comes from "drilling with a cone, dyeing with painting, like sand", which means drawing lines, dots and diagonal lines with a small cone to describe all kinds of soft, smooth and changeable lines. The main characteristics of cone-shaped sand painting are fine, soft, fluid and refined, which are mainly used to write bamboo slips, calligraphy and other works. Its fine lines often give people a multi-level three-dimensional sense and expressive force, and can also show the identity, temperament and literati charm of the theme. Tapered sand painting is a difficult part of calligraphy techniques, which requires artists to be very skilled in the use of tapered pens, and at the same time, they need to constantly hone their ability to control lines and observe them carefully.