Now, that there is in heavy matter a distinction as that of a foundation and a modification of it distinct from it through which it constitutes a habitation, this is to gravity itself totally indifferent; the reference connecting it to the other content determinations, the purpose, the furnishings of the house, etc., is external to it; gravity, therefore, though it is the common substrate of the determinations constituting the house, is not the ground of it as house.