Of course, all this does not mean that the image "more is up" is wholly arbitrary. When water is poured into a bottle, for instance, the more water there is, the higher its level. And if apples are piled up in the larder, the more apples, the higher the pile, so the image "more is up" is clearly rooted in real life and based on experience.
This comes from "The Unfolding of Language - an evolutionary tour of mankind's greatest invention". I find this topic fascinating. I think language to a large extent determines many of our thinking mechanisms. If you don't have "have" or possessives (hers, his, ours etc.) in your language then you don't really understand the notion of ownership.
Sometimes I wonder if it's possible to have an ego without language. Because if it's not, then ego is born of language - and therefore "unreal".
Incidentally, I didn't know what a larder was either. (It's a synonym of "pantry")
If you feel so inclined, feel free to do this one. Thanks to Daniel who made this morning's topic hunt so eaaaaasy.