Real Structure Is Not Yet Unity: Unit Grounds and Disciplined Abundance

Philosophy of science has well-developed criteria for when structure is real: patterns that compress and predict, mechanisms with constitutively relevant components, causally emergent macro-variables, statistical boundaries that screen an interior from an exterior. These criteria are also used to tell us which systems are units, individuals in their own right rather than selections we make. I argue that this promotion fails, and that the accounts of individuality built on it have not shown that anything is a unit. Real structure is often shared by rival cuts of the same substrate, whereas unity requires something that resolves rivalries between cuts. Individuating a unit therefore involves two burdens: realized modal support, which real-structure criteria discharge, and a unit ground, an organization of the realizer that makes this cut the unit. I state adequacy conditions for unit grounds, separate their holding from their evidential discharge, and propose a constitutive intervention test with matched negative controls and a selectivity condition. Applied to real patterns, Markov blankets, information-theoretic individuality, causal emergence, integrated information and individuating mechanisms, the conditions show what each account lacks: some fail to discriminate between rival cuts, some discriminate by maximizing a measure whose maximizing cut still owes a ground, and some supply candidate grounds without a way of resolving rivalries in which both rivals are units. Partial audits of a key–value server, a bacterial cell and a heating loop suggest that the bottleneck is not relevance, for which discharging experiments can be specified, but screening the exterior and discriminating between rival cuts. In object-oriented programming, where Kay modelled the objects of Smalltalk on biological cells, the two burdens visibly come apart: one declared profile, equally well realized, can rest on candidate grounds of very different strength, down to a bare declaration. The upshot is disciplined abundance: units can be many and nested, but nothing becomes a unit through packaging, unions, target-selected subcuts or boundaries alone. A double stratification problem, of levels and of stages, remains open.