View source for Why is Classical Chinese written from right to left?

Classical Chinese was written from top to bottom, from right to left. There are few reasons why, and I will start with the most rational one with the top.

1. Bamboo and wooden slips (竹簡)
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Bamboo and wooden slips were rolled into a scroll, and it was rolled opened from right to left while right hand is holding the right end. So, it's only natural to have the writing start from the right. Sinosphere isn't the only region where writing is done from right to left. All civilizations that kept its words in a scroll early days did the same. For example, Torah was kept as a scroll so we find Hebrew being written from right to left. However, it wasn't written from top to bottom one line at a time because the material used was either papyrus or animal skin, while wooden slips only provided a narrow space just enough to fit one line of text.
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2. Brush strokes are easier written from top to bottom
The strokes of a character were written usually from top to bottom, so it was more natural to continue writing at the bottom of the character.


3. Right side had philosophical significance from the ancient times
Right side signified dominance and it was considered more valuable than the left side. It's only rational to consider the right side with anything that's related to the use of hand to be superior than the left. (In the past, people did not try to standardize things for the masses like it is today, so arguing that it is unfair to write according to the rules of Classical Chinese is similar to saying that people in the past were uncivilized because they didn't value keeping time due to the lack of clocks.)

Also, kings and parents usually sat on the upper ground.

The old expression 无出其右 means there is nothing more superior in wisdom or abilities to the right.