Many copybooks or masterpieces are slightly tilted upward. So why write it like this? Many teachers who run calligraphy classes also ask students to do the same. In my opinion, this is a misunderstanding. First of all, ask them why they are leaning upward. In fact, horizontal and vertical are also beautiful (running script and cursive script are not bound by this). Generally speaking, when we write a pen, our elbow will not move too much from sitting posture to holding the pen, so if we draw a long horizontal line on the paper, our hands will naturally move to the upper right and the horizontal line will naturally tilt upward. This is a slight inclination in the horizontal direction determined by the human body structure, and calligraphy, especially regular script, does not pursue this inclination. Don't deliberately tilt the horizontal line. Especially for the guidance of primary school students, we must not write obliquely, because all the words written by the first generation are oblique. Adults are not sure, let alone children. I hope that teachers who know a little calligraphy will not mislead others. This article is only applicable to pen regular script.