The format of vertical Chinese characters: the first column (counted from right to left, not marked at the bottom) is blank for 2 boxes or the title is written in the middle, the second column begins to write the text (blank for 2 boxes), and the last column is signed or sealed.
Advantages of vertical characters: Ancient calligraphers with writing brushes left the paper, so they wrote smoothly. Modern pens and ink paintings, if they are vertical, are easy to be erased by hand, so they are not easy to write.
Simplified characters rarely have vertical characters, and almost all of them are written in traditional Chinese characters.
Extended data:
The reason why the ancients wrote vertically is because before papermaking was invented, the ancients wrote on bamboo slips. Bamboo slips and wooden slips are long and narrow pieces of bamboo, which can be rolled into books when strung together. The word "book" is a pictograph of bamboo slips. It is natural to hold the book in your right hand when you open it, and it is also convenient to unfold it in your left hand. Therefore, writing is from top to bottom and from right to left. In ancient times, bamboo slips were written piece by piece and then bound into a book.
Judging from the characteristics of Chinese characters and people's physiological habits, the stroke order of a word is naturally convenient. If you write horizontally from right to left, when you write the left half, the brush will inevitably cover the right half, which is inconvenient to arrange the structure and affects the beauty of the knot. The last stroke of each Chinese character is in the middle or lower right, and the last stroke of the previous word is followed by the beginning of the next word. Vertical writing is more convenient for the continuity of strokes than horizontal writing.