A digital twin is never only a technical replica. It is a political address system. It speaks to engineers, planners, software, sensors, administrations, interfaces, citizens, vehicles and models at once. DualAddress names this condition: the need for urban knowledge to communicate simultaneously with human subjects and machine systems without collapsing one into the other. This reader studies inclusive mobility, digital twins and urban belonging as one field because movement in the contemporary city is increasingly mediated by models, but belonging is still lived through bodies, memories, attachments and unequal access. The European debate on inclusive and sustainable urban mobility provides the first frame. Mobility can no longer be treated as a narrow transport-sector problem. It is ecological, social, digital, spatial and institutional. Electrification, autonomous vehicles, logistics systems, artificial intelligence and connectivity must be read alongside children, older people, disabled users, transport poverty, public participation and municipal capacity. The future of mobility is not simply a future of cleaner or smarter movement. It is a future of differentiated access.

Digital twin research brings this problem into technical focus. Li and colleagues’ concept of Digital Twin Federation is especially useful because it refuses the fantasy of one total urban model. Mobility systems are distributed across infrastructures, platforms, behaviours, sensors, institutions and temporal scales. Their twins must be federated rather than monolithic. The inclusion of human-in-the-loop architecture is crucial. It recognises that urban mobility cannot be governed by automated representation alone. Stakeholder judgment, behavioural uncertainty and public deliberation must remain inside the model. Nag and colleagues’ review of transport digital twins sharpens this through classification. Many systems described as digital twins are actually digital models or digital shadows. A model represents. A shadow receives data. A twin requires interaction, connection, service and feedback. HybridLegibility becomes relevant here because the urban twin must be legible to both technical systems and public actors. If a twin can be understood only by specialists, it risks becoming another opaque instrument of governance. If it is simplified only for public display, it may become symbolic theatre. The challenge is hybrid readability.

Urban correction begins when the city’s official descriptions are no longer trusted as sufficient. Displacement, gentrification, misrecognition, datafication and infrastructure often produce realities that standard planning language cannot adequately register. KnowledgeFriction names the productive resistance that appears when evidence, lived damage, institutional categories and public truth do not align. It is not confusion. It is the necessary friction through which better urban knowledge becomes possible. This reader begins with displacement beyond removal. Knieriem, Lagendijk and van Leeuwen’s work on Rotterdam’s Tweebosbuurt shows that gentrification is not only the physical relocation of residents. It is also misrecognition: humiliation, civic erasure, disregard, denial of standing and the destruction of social dignity. Residents do not only lose space. They are told, directly or indirectly, that their attachments, histories and claims matter less than redevelopment narratives.

Schnelzer’s processual theory deepens this by distinguishing becoming displaceable, feeling displacing and un/doing displacement. Displacement is not a single event. It is a distributed condition that begins before eviction and continues after relocation. It includes vulnerability, anticipation, fear, manoeuvre, adaptation and the gradual reorganisation of everyday life. Elliott-Cooper, Hubbard and Lees call this un-homing: the destruction of home’s conditions before, during and beyond physical movement. Slater’s return to Marcuse insists that displacement must remain central to gentrification theory, not treated as an incidental or difficult-to-measure side effect. KnowledgeFriction emerges because these experiences often exceed available data. A rent increase can be measured. A demolition notice can be archived. But humiliation, anticipatory anxiety, loss of neighbours, symbolic erasure and civic disrespect are harder to count. This does not make them less real. It means urban knowledge must expand its evidentiary forms. DiagonalReading becomes a secondary operator because the problem must be read across categories: housing, affect, law, infrastructure, race, class, data, cartography, public language and bodily exposure.

Mobility data justice begins from a simple displacement: transport should not be judged primarily by movement, but by access. A city is not just because it contains roads, vehicles, apps, dashboards or modal options. It becomes just when differentiated persons can reach work, care, education, health, food, shade, public life and social connection without excessive cost, risk, waiting, exclusion or bodily exposure. CitationalCommitment names the ethical obligation to account for what is counted, who is cited by data, who is omitted, and how mobility evidence becomes public responsibility. The ITF’s Sustainable Accessibility for All provides the normative centre. Accessibility shifts the question away from kilometres travelled and toward opportunities reached. This matters because mobility can increase while justice decreases. A city may become faster for some and more fragmented for others. It may optimise flows while deepening transport poverty. Access requires person-based and territory-sensitive metrics: age, income, gender, disability, household structure, settlement pattern, service availability, temporal burden and digital connectivity all matter.

Behrendt and Sheller’s concept of mobility data justice deepens this by showing that movement now generates data almost continuously. Ticketing systems, navigation apps, shared mobility platforms, sensors, vehicles, road infrastructures and environmental monitoring systems all produce traces. But datafication is uneven. Some movements are over-visible and surveilled. Others are absent, informal, too complex or institutionally ignored. MetadataSkin becomes important here because the outer informational layer attached to mobility users can determine how they are represented and governed. The skin is not superficial. It mediates access, risk and recognition. Recent work on mobility equity metrics attempts to formalise fairness within intelligent transportation systems. Bang and colleagues propose a metric combining service accessibility and transport cost, using distributional tools to evaluate fairness. Such work is valuable because it pushes equity into system design rather than treating it as a rhetorical appendix. Yet CitationalCommitment also asks what every metric leaves outside. A Gini coefficient may show distributional inequality, but it may not capture fear, heat, humiliation, disability friction, care work or attachment to place. Metrics must be treated as instruments, not substitutes for politics. AI-powered transportation digital twins add further complexity. Fu and colleagues describe cyber-physical transport twins with sensing, prediction, decision-making and feedback. Their distinction between a twin’s eyes and brain is useful: perception alone is insufficient without interpretation and response. But the political question remains: whose vulnerability does the twin detect? Vulnerable road users may be technically recognised while other vulnerable populations remain invisible. LegibleArchive becomes relevant because mobility data must not be only real-time flow. It must also preserve evidence, provenance, historical inequity and accountability over time. Climate makes mobility justice more material. Cabrera, Ziegler and Schläpfer’s work on targeted cooling of cycling networks shows that heat exposure concentrates unevenly across routes. A small portion of a network may generate disproportionate thermal burden. CDRI’s guidance on heat management in public transport similarly treats heat as an operational and equity issue. Shade, waiting, station design, vehicle comfort, hydration, surface temperature and elderly bodies become transport variables. Thermal stress reveals that access is never abstract. A route may exist and still be unusable under climatic pressure.

The Recursive Life of Communication: Neural Logic, Information, Ecology and Social Systems (Shannon, McCulloch, Pitts, Bateson, von Foerster, Luhmann) · LAPIEZA LAB · Anto Lloveras · Socioplastics · 2026

The strongest nexus across Shannon, McCulloch and Pitts, Bateson, von Foerster and Luhmann is the displacement of knowledge from substance to relation: intelligence no longer appears as a hidden essence, interior faculty or sovereign subject, but as a recursive organization of distinctions, signals, thresholds, feedbacks and communications. McCulloch and Pitts formalize nervous activity as a logical calculus, showing that neural events can be treated as propositional operations rather than mystical contents; Shannon strips communication of semantic privilege in order to define information as selection under uncertainty, transmitted through channel, code and noise; Bateson radicalizes this shift by making “difference” the minimal unit of mind, extending cognition into ecology, pattern, play, pathology and civilization; von Foerster turns cybernetics toward the observer, insisting that cognition is not passive registration but active construction; Luhmann then transfers the entire problem into social theory, where society is not made of individuals but of communications recursively reproducing communications. Together, these works do not simply found cybernetics, information theory or systems theory. They produce a new epistemic scene in which thought is infrastructural: it operates through circuits, delays, distinctions, redundancies, closures, environments and second-order observations. The mind is no longer located in the head alone, nor meaning in the message alone, nor society in the human actor alone. Each text attacks a different version of naïve realism: the neuron is not an idea but can behave logically; the message is not its meaning but a selected possibility; the organism is not outside its ecology but patterned by it; the observer is not outside observation but implicated in it; the social system is not a container of subjects but an autopoietic field of communicative difference. The common concept is therefore recursive epistemology: knowledge as the patterned production of distinctions inside systems that can never fully step outside their own operations.