I was listening to an interview tonight and he was talking about how some languages are read from right to left, some from left to right, and he explained what could be the reason for that. He said that at one time, people wrote in any direction because the letters were pictures that were symbols. He said that if the writer was using a pen or brush (and was right handed) then he would usually write from left to right so as not to smear the ink. But if the person was chiseling into rock, then he would have the chisel in the left hand and the hammer in his right hand; so then he would chisel from right to left. I had never thought about that before, and it might not have stayed that way always, because more places strted writing with ink and not chiseling on rocks.