which implies that they were painted horizontally before the block was laid.
however the photographs I have seen seem to indicate that the characters lean or slant . flip it 90 deg on the computer .. the whole thing.. not just the cartouche. This indicating that they were painted in situ by a right handed person.
I guess they could have been painted vertically, in situ five thousand years ago, but why??
try to make horizontal lines on a wall one above the other while standing to one side, as if writing