The long and pointed part in the center of the tip of the brush is called the "front", and it is surrounded by shorter hair called the fuha. The reason why the brush is made like this is to make it easier to hold ink in the middle of the pen tip. When the tip of the pen moves in pointillism, the ink will flow down along the tip wherever it moves, and will not tilt up or down, left or right, but It spreads evenly and covers all sides.

"Hidden Feng" means: "If you want to look left or right, if you want to go up, go down first." That is, at the beginning of the stroke, stroke in the opposite direction and hide the tip of the pen in the stroke. The ancients said: "Hiding the front is to contain its energy, and exposing the front is to control its waves." "With a front, it shines, and without a front, it contains its energy." The strokes with a hidden front are round, strong, and thick; the strokes with an exposed front are sharp and energetic.

"Reverse" means to tilt the pen barrel in the opposite direction of the stroke. "Reversing the front" means that the stroke of the pen moves in a retrograde direction (that is, in the opposite direction to the habitual stroke), and its effect is dry and clumsy.