 In the early 1930s Neurath would point to weakness and incompleteness of the logical and linguistic relations between different kinds of scientific statements—mainly due to the unavoidable presence of vague cluster-concepts, or congestions (Ballungen). They consisted in linguistic manifestation of the ineliminable social, everyday, non-theoretical vague elements of language and of the intrinsic complexity of the world discussed in the German metaphysical literature and the later socialist debates (Cat 1995 and Cartwright et al. 1996). Since then his notion of unity is phrased in terms of an anti-reductionistic and anti-systematic—anti-axiomatic—‘encyclopedia model’, by establishing cross-connections among disciplines, as in a Crusonian archipelago: a ‘great, rather badly coordinated mass of statements’ in which at best ‘systems develop like little islands, which we must try to enlarge’ (Neurath 1936/1983, 153).