Why should calligraphy be written vertically from right to left? How long will it take to change this habit of China people?

Because there was no paper in ancient China, it was written on bamboo slips, which were made of bamboo strips, so it was convenient to write vertically. Later, it became a habit and has been used all the time. According to China's etiquette, rights were respected in ancient times. The important position in the official position is called "the right position". If we say "the man who can't beat him", there is no higher position than him. Some people think that the early writing was to carve characters on bamboo slips with a knife and put one on the right hand side, so it became from top to bottom, from right to left, or because ancient bamboo slips were all rolled into a tube, if you write from left to right, you must spread all the bamboo slips before writing. If you write from right to left, you can spread it while writing, which is very convenient.