{
  "schemaVersion": 3,
  "cityId": "red-horizon",
  "seed": "red-horizon-shared-air-01",
  "title": "Shared Air, Distant Earth",
  "sourceWorld": {
    "worldId": "red-horizon",
    "hook": "A Soviet Martian commune keeps its collective promise through maintenance and shared life.",
    "story": "Sparse crater-side tones become the regular pulse of pumps and communal corridors, with the same restrained four-note phrase heard outside and inside."
  },
  "intent": {
    "oneLine": "A low Dorian work-song fragment moves from distant glass and air into warm organ harmony, measured bass and quiet metal pulses.",
    "keywords": [
      "collective",
      "austere",
      "patient",
      "orbital",
      "warm interiors",
      "mechanical pulse"
    ],
    "avoid": [
      "bombastic military march",
      "literal speech or choir",
      "birdsong",
      "busy percussion",
      "continuous lead melody"
    ]
  },
  "musicalIdentity": {
    "bpm": 72,
    "swing": 0,
    "rootMidi": 38,
    "scale": "dorian",
    "signatureMotif": [
      0,
      4,
      5,
      2
    ],
    "progression": [
      0,
      3,
      5,
      0
    ],
    "phraseBars": 8
  },
  "worldFingerprint": {
    "meter": "4/4",
    "timingBehavior": "steady",
    "material": "metal-cable",
    "spatialShape": "vertical-echo",
    "arrangementBehavior": "call-response",
    "register": "low",
    "silence": 0.38
  },
  "samplePalette": [
    {
      "material": "metal",
      "intensities": [
        "medium"
      ]
    },
    {
      "material": "plate",
      "intensities": [
        "heavy"
      ]
    },
    {
      "material": "glass",
      "intensities": [
        "light"
      ]
    }
  ],
  "soundEffects": {
    "building.place": {
      "label": "Panel seated",
      "description": "A compact metal contact marks a module joining the commune.",
      "sample": {
        "material": "metal",
        "intensity": "medium"
      },
      "gain": 0.42
    },
    "building.remove": {
      "label": "Plate released",
      "description": "A restrained heavy plate contact accompanies removal.",
      "sample": {
        "material": "plate",
        "intensity": "heavy"
      },
      "gain": 0.32
    },
    "placement.invalid": {
      "label": "Access refused",
      "description": "A soft glass tick accompanies the engine\u2019s invalid-placement gesture.",
      "sample": {
        "material": "glass",
        "intensity": "light"
      },
      "gain": 0.14
    }
  },
  "spatialMix": {
    "nature": {
      "label": "Crater distance",
      "description": "Widely spaced glass notes, a low sustained bass and hazy chords leave long gaps over a faint air texture; this is a musical impression of distance, not literal exterior sound.",
      "keywords": [
        "sparse",
        "distant",
        "breath",
        "regolith"
      ],
      "lead": "glass",
      "bass": "sub",
      "pad": "haze",
      "drums": "dust",
      "texture": "air",
      "brightness": 0.28,
      "space": 0.8,
      "grit": 0.12,
      "density": 0.16
    },
    "city": {
      "label": "Shared shift",
      "description": "A measured bass and restrained metal beat carry an organ chord response and low pulse melody, with every fourth bar opening into silence.",
      "keywords": [
        "pump cycle",
        "communal",
        "enamel",
        "steady"
      ],
      "lead": "pulse",
      "bass": "round",
      "pad": "organ",
      "drums": "metal",
      "texture": "machinery",
      "brightness": 0.38,
      "space": 0.32,
      "grit": 0.24,
      "density": 0.46
    },
    "transition": {
      "curve": "equal-power",
      "description": "Both layers keep the same eight-bar phrase and harmonic roots; moving inward brings the mechanical pulse forward while distant glass and air recede."
    }
  }
}