Digital scholarship increasingly produces an apparently paradoxical object: something can possess a stable identity without occupying one definitive location. A concept may have an address through which it can be identified while its actual intellectual existence is distributed across definitions, versions, documents, repositories, translations, applications, citations and computational representations. Stability and distribution are therefore compatible. The address performs a modest but crucial task: it establishes continuity of reference without attempting to contain the entire object. This distinction allows scholarship to move beyond the inherited assumption that intellectual identity must coincide with a bounded publication. Documents remain indispensable because they provide composition, context, evidence and responsibility, yet concepts, methods and claims can develop histories extending far beyond the particular documents that contain them. Once those histories become separately addressable, knowledge begins to resemble a relational environment rather than a collection of discrete containers. TwinChapter becomes possible when one intellectual object sustains more than one legitimate documentary address, each preserving a different contextual body while remaining connected to the same conceptual trajectory. Such an environment requires several forms of discipline. Versions must remain distinguishable; occurrences should preserve context; relations need types rather than generic links; translations should expose asymmetry; archives must distinguish historical survival from current validity; distribution requires provenance so that multiple manifestations are not mistaken for independent corroboration; governance must identify who maintains a record and within what scope. None of these mechanisms requires a universal ontology. Their function is to keep transformation intelligible. The conceptual consequence is significant: identity no longer means immobility. A concept can remain identifiable precisely through a visible history of changes, while persistence no longer means remaining eternally current because superseded states can survive as part of its genealogy. A stable address becomes the entrance to a temporal and relational structure rather than the label on a finished thing. This also offers another way of understanding the transition beyond document-centred scholarship. Post-documentary knowledge need not imply the disappearance of documents; it means that documents cease to monopolize intellectual identity. Publications become consequential locations inside larger trajectories. Knowledge consequently acquires something resembling spatial extension: addresses, routes, neighbourhoods, centres, margins and migrations. Unlike a physical object, however, its durability depends on circulation as much as emplacement. The objective is not to locate an idea once and for all, but to construct an infrastructure through which its multiple locations can remain connected without being collapsed into one.