Stationery, several inches to several feet long, is used for spacing lines, drawing straight lines or pasting books. A tool used by Buddhist monks to say commandments. A ruler is stationery, which is used to draw boundary lines and also to weigh pieces of paper. It is different from a ruler. Ruler is a tool for drawing lines and paper, and its material is not recorded.
In Biography of the Five Dynasties, Zhao, whose real name was Tingji, was quite famous in the Tang Dynasty. He was called outspoken and sometimes called the Jade Emperor. Or it can be inferred that there are people who take jade as their ruler. Calligraphy has a long history. Bounded grid lines can be found in official script inscriptions, paper works and related epitaphs.
Explain the ancient emphasis on writing. The traditional manual folding is to fold the writing paper into a broken line grid with the corresponding size and number of words according to the size and font of the work to be written, and leave the upper, lower, left and right boundaries and the position of the inscription. Therefore, the boundaries should be clear and accurate, and the number of rows, columns, words, paragraphs, up and down, left and right numbers are accurate and equal, with great errors.
Although a common ruler can draw boundaries, it often leads to miscalculation of grid size, marking deviation, and takes a long time, thus greatly wasting the preparation time for practice and creation. In today's high-paced society, it is not easy to spare precious study time to continue hobbies, adhere to traditions and carry forward the quintessence of the country. If the tedious extra preparation time can be used for effective writing practice, it will be beneficial to the improvement of personal calligraphy.