Movement to conceptual adjacency is also greatly facilitated in hypertext. For example, topics related via hierarchical taxonomy might be, for instance, political entities under which we find United States under which we find New Jersey. Within this vertical taxonomy, we can articulate conceptual adjacency moving from New Jersey to New York or Pennsylvania or even New Mexico. All members of the Venn set United States may be considered conceptually adjacent. The same would be true for the hierarchical linking of, say, animals to its subordinate and more specific mammals, where chimpanzee, dog, and cat are conceptually adjacent. Hypertext can facilitate linking of concepts and the implied development of ideation through both conceptual adjacency and hierarchical nesting, balanced as suits the craft and purposes of the architect. Are there other workings of logic manifest in hypertext? Consider tangential free association.

Concept adjacency may be considered as an indicator of utility nearness or quality nearness. As in a family we may consider siblings, cousins, second-cousins and so forth, ideas can be analyzed in terms of cognate relationships. Also, just as individuals in a family of siblings and cousins are each uniquely related to the other particular members of the same Venn set, so concepts, topics and ideas can be shown to describe a horizontal matrix of reference points that bear, in some sound analysis, a familial feature quality that can be described in degrees of nearness.

And, as in a family where the horizontal specification of sibling, cousin, or second-cousin is located by the designation of parents and grandparents - a defining hierarchical relationship - so in a horizontal matrix of ideas, topics, or concepts, a hierarchical reference point of encompassing classification defines the shared qualities of any subordinate set of particular considerations - ideas, topics, concepts, or what have you.