Urban environmental evidence becomes unstable as soon as the city is understood as something encountered in motion rather than a set of qualities attached to fixed locations. A residential green-space indicator cannot reconstruct a person's daily routes, the duration and timing of exposure, the circumstances under which a landscape is noticed, or the possibility of withdrawing from demands elsewhere. Deng and colleagues foreground mobility as a condition of exposure, while Harries and colleagues make attention itself part of the environmental relation. Gatersleben and collaborators complicate the assumption that environmental benefit follows from exceptional natural amenities: everyday places may matter because of the particular respite they afford under constraint. The large corpus analysed by Hampejs and colleagues introduces a productive tension between the scale of reported encounters and the irreducibility of situated experience. These approaches do not simply supply complementary variables for a single predictive model. They propose different objects of knowledge: movement through environments, perceptual engagement with them, everyday opportunities for restoration and retrospectively narrated benefits. Their juxtaposition makes clear that an apparently simple question, such as whether a neighbourhood is restorative, can contain several non-equivalent questions about availability, access, attention, use and memory. A credible comparison must preserve those distinctions before attempting to measure their relations. The same caution extends to public participation. Perlaviciute's examination of participation and policy acceptability prevents a further conflation: the presence of a consultation process does not establish that environmental decisions are legitimate, representative or accepted. Measurement becomes political at the point where a partial observation is promoted into a general description of collective life.

For Socioplastics, the consequence is an archive in which the evidence of a place is not exhausted by a geolocation, an image or a satisfaction score. A route may be indexed as a sequence of encounters; a recorded impression may be associated with its circumstances rather than detached from them; a landscape feature may be distinguished from the attention it receives; and an environmental benefit may be described without assuming that everyone can access the same conditions of experience. Such distinctions are not merely refinements in metadata. They shape what a comparative corpus can claim and which differences it is permitted to retain. The same urban segment might appear accessible in a network analysis, restorative in a retrospective account, oppressive during a particular journey and invisible within an automated environmental classification. These records need not be forced into agreement. Their divergence can disclose the limits of each instrument and the institutional assumptions under which its evidence is produced. Gabrys and Hamilton-Jones sharpen this point by showing that digital environmental technologies also transform the practices of governance: sensing systems are arrangements of authority as well as devices of observation. A comparative walking archive should therefore make the provenance of observations, the conditions of participation and the status of automated classifications inspectable. It should enable retrieval across territories without treating situated meanings as interchangeable units. What appears as missing data may instead be a missing opportunity to move, a missing capacity to attend, or a missing route into public decision-making. The value of the corpus lies in maintaining these differences as researchable relations, allowing comparison to become a test of categories rather than their unquestioned application.