All the qualities of the physical world exist through the interrelations of things to each other. What Moleschott says is correct for physical existence: “All existence is an existence through qualities. But there is no quality that does not exist through a relation.” Just as everything of a soul nature contains something in itself by which it points to something outside itself, so conversely, a physical thing is so constituted that it is what it is through the relation to it of something outer.