2. First of all, the ancients wrote vertically because they wrote on bamboo slips before papermaking was invented. Bamboo slips and wooden slips are long and narrow pieces of bamboo, which can be rolled into books by stringing them together. The word "book" is a pictograph of bamboo slips.
3, and opening the roll is naturally the right hand holding the end, and the left hand is convenient to unfold. Therefore, writing is from top to bottom and from right to left.