Community measurements travel up into City, and City into Region. Region is where governance ends. Above the line are boundary observations, not aggregations.
This atlas shows how Fab City Index scores aggregate across scales — the deep-dive companion to the public index. Three concentric framings — Community innermost, City, Region outermost — read as one matryoshka, each scale nested inside the next. Each ring is the Fab City Index 3.0 score at that scale, for the selected city. The score is always the same product: DIDO — data in, data out, what a place can make and share — times (1 − PITO) — products in, trash out, what it still imports and wastes — times ρ, the response coefficient: how fast observation becomes action. To the right, the boundary context (Bioregion and Planet) renders in a separate visual register. That distinction is the conceptual move of the framework: only Community, City, and Region are aggregation targets. Bioregion and Planet are read as constraints.
Matryoshka aggregation rings
City = Governance
Region = Governance · CEILING
Bioregion = Boundary
Planet = Boundary + global knowledge
Why the matryoshka stops at Region. The Vivanco framework assigns three of the five scales an aggregation role (Community and City and Region) and the upper two a boundary role. Community is where instruments touch the ground; City is the first governance horizon; Region is the last governance horizon. Above Region sits the bioregion's biocapacity and the planet's transgressed boundaries — these are constraints, observed, not built up from below.
Operationally this matters because we have been asked to defend why no “Bioregional FCI score” rolls up into a single number the way Region does. The honest answer is that there is no human institution at Bioregion or Planet capable of receiving such a score and acting on it inside the action-latency budget ρ. There is only ecological and planetary reference. The matryoshka renders that asymmetry visible.
↪ Next: read the scale-by-scale walk — these rings as a narrated story — or open the aggregation rules for the method behind each roll-up. New: see the same rings drawn on real geography in the aggregation map.