The phrase "Dian Ru Shi Falling from the Sky" comes from Ouyang Xun's "Eight Secrets". "The points are like rocks falling from the peak, the horizontal lines are like clouds forming thousands of miles away, the vertical lines are like long-lived withered vines, and the hooks are like the hair of a hundred-jun crossbow." The point is like a falling stone, which is both form and movement potential. It can be regarded as a static shape. If time is frozen at a certain point, when the stone is about to fall, the shape of the stone will be a point. It can also be seen as momentum. When a stone falls from a mountain, it has a sense of downward force, and the same goes for the movement of the brush. When the brush falls or slides from top to bottom, the movement of the brush is like the momentum of the fall, which has a sense of power.