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. Jane in the left hand and a pen in the right. After writing, push one by one from left to right, line up, and then take the new Jane in your left hand.
This can make full use of the desktop space, and the new bamboo slips will not be confused with the already written bamboo slips. 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.
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Other words are also written from right to left:
Arabic and Hebrew are written from right to left, which is said to be related to ancient people carving words on stones. For the average person, with a drill in his left hand and a hammer in his right hand, the direction of lettering is naturally from right to left.
Xinhuanet-The Mystery of Ancient People Writing from Right to Left