Fabian O. answered 04/01/19
Skilled College Tutor Specializing in Education Management
I think it was a technique so that right-handed writers will not smudge their work when writing from right to left. It is also easier to read that way. Some approaches used in the past include having one line written right to left, and the next from left to write. It would have been easier for specific people to read the writing like scribes than than typical readers. Some languages like Japanese are written horizontally and vertically, and this is because they use characters instead of letters as is the case with English.