At any rate we can agree that the point has been made. It's not like you need some external factor (prove that the reason for this is the fact that Japan is an

At any rate we can agree that the point has been made. It's not like you need some external factor (prove that the reason for this is the fact that Japan is an island, or any other thing.) China doesn't need to be "drier" to make the Chinese wheelbarrow we're reading about more useful, with the idea that the wheelbarrow difference can be explained in full by the presence of mud in the west. You don't need any difference like that. It can just be a cultural map of adoption, with no real reason for it.