Experience is built up entirely out of opposites, or rather by the forces acting between opposed polarities on multiple hierarchical levels. Thus, full and empty, good and bad, distinguished and undistinguished, thing and nothing. There can only be opposites if there is a common ground for their opposition and that ground is necessarily excluded from the oppositions that it hosts. This is obscured by the fact that every ontological category that has any meaning of application is only so by way of its being opposed, being in opposition. The ground of appearance does not appear and what appears cannot ground any other appearance.