Does something which exists on the edge have no true relevance to the stable center, or does it, by being on the edge, become a part of the edge and thus a part of the boundary, the definition which gives the whole its shape?

Does something which exists on the edge have no true relevance to the stable center, or does it, by being on the edge, become a part of the edge and thus a part of the boundary, the definition which gives the whole its shape?