Why is the first character of calligraphy so thick and the font behind it so thin?

Why the first word of calligraphy is so thick and the font behind it is so thin is an expression habit. Calligraphy is one of the traditional arts in China. It is the art of writing Chinese characters with a brush to express the author's spiritual beauty. China's paintings and calligraphy are dominated by lines, and the tools used are all sharp pens. In order to enrich the line stippling of calligraphy and painting, we should first pay attention to writing, and grasp the weight, speed and correctness when lifting the pen. The straight line method and other methods are called brushwork. On the one hand, the style of ink often varies from person to person, on the other hand, it often varies with the performance of writing and paper.