Two odd things strike me: 1. 5 is the symbols for 4 and 1 combined, 6 is new, then 7=6+1, 8=6+2, and 9=6+3. It seems to me it would be more obvious to have 1 t

Two odd things strike me: 1. 5 is the symbols for 4 and 1 combined, 6 is new, then 7=6+1, 8=6+2, and 9=6+3. It seems to me it would be more obvious to have 1 to 5 be unique symbols, then 6=5+1, 7=5+2, 8=5+3, and 9=5+4. Like how we do with tally marks. 2. The system is really just 4 digits combined in a square. I don't see the advantage over Arabic numerals.