The picture comes from the internet.
In the past, books were all arranged vertically, so they should be read from the right, and ancient couplets should be written from right to left, so the upper couplet was on the right side of the door and the lower couplet was on the left side of the door. Sticking Spring Festival couplets should conform to traditional rules. Spring Festival couplets should be posted vertically, knowing that the first couplet should be posted on the right hand side and the second couplet should be posted on the left hand side. Horizontal batches are also read from right to left.
The picture comes from the internet.
In addition, when people face couplets, the upper couplet is generally on the right and the lower couplet is on the left, so they should pay attention to the rhythm. The method of judging the uplication needs to be based on the flat tone of the last word. The upper couplet is usually flat, and the lower couplet is usually flat, mainly for phonological harmony.