"Thus UP is not understood purely in its own terms but emerges from the collection of constantly performed motor functions having to do with our erect position relative to the gravitational field we live in. Imagine a spherical being living outside any gravitational field, with no knowledge or imagination of any other kind of experience. What could up possibly mean to such a being? The answer to this question would depend, not only on the physiology of this spherical being, but also on its culture." (#60 1063)