Are you also writing right-to-left, then? If everything about the system is reflected (including having a reading order of right-to-left), then you're right, it's not meaningful. But it's also not what's proposed in the OP here. When the two-dimensional text on the screen is re-formed into a linear string, it is the right end of line N that is attached to the left end of line N+1, and so the right-hand arguments of functions are "after" the left-hand arguments.