{
  "schemaVersion": 3,
  "cityId": "fractal-citadel",
  "seed": "fractal-citadel-recursion-031",
  "title": "Echoes Within Echoes",
  "sourceWorld": {
    "worldId": "fractal-citadel",
    "hook": "Light and sound emerge from nested voids in an obsidian city.",
    "story": "A civilization that thinks in recursion grows resonant chambers into its buildings; civic pulses are compressed versions of the intervals heard across the empty plateau."
  },
  "intent": {
    "oneLine": "A low whole-tone resonance carries the same four-note glass motif at two time scales, punctuated by quiet ceramic-like impacts and diminishing echoes.",
    "keywords": [
      "nested intervals",
      "whole-tone symmetry",
      "crystal apertures",
      "inner resonance",
      "measured silence"
    ],
    "avoid": [
      "orchestral fantasy swell",
      "dance backbeat",
      "birdsong",
      "continuous busy arpeggios",
      "loud error buzzers"
    ]
  },
  "musicalIdentity": {
    "bpm": 60,
    "swing": 0,
    "rootMidi": 40,
    "scale": "whole-tone",
    "signatureMotif": [
      0,
      2,
      0,
      4
    ],
    "progression": [
      0,
      2,
      4,
      2
    ],
    "phraseBars": 8
  },
  "worldFingerprint": {
    "meter": "4/4",
    "timingBehavior": "steady",
    "material": "glass-water",
    "spatialShape": "vertical-echo",
    "arrangementBehavior": "evolving",
    "register": "low",
    "silence": 0.55
  },
  "samplePalette": [
    {
      "material": "glass",
      "intensities": [
        "light",
        "medium"
      ]
    },
    {
      "material": "bell",
      "intensities": [
        "heavy"
      ]
    },
    {
      "material": "soft",
      "intensities": [
        "heavy"
      ]
    }
  ],
  "soundEffects": {
    "building.place": {
      "label": "Crystal joint seated",
      "description": "A restrained glass impact accompanies the universal placement gesture.",
      "sample": {
        "material": "glass",
        "intensity": "medium"
      },
      "gain": 0.38
    },
    "building.remove": {
      "label": "Resonance released",
      "description": "A quiet bell strike marks a structural connection releasing.",
      "sample": {
        "material": "bell",
        "intensity": "heavy"
      },
      "gain": 0.28
    },
    "placement.invalid": {
      "label": "Pattern does not resolve",
      "description": "A soft muted impact acknowledges the invalid placement without competing with the music.",
      "sample": {
        "material": "soft",
        "intensity": "heavy"
      },
      "gain": 0.13
    }
  },
  "spatialMix": {
    "nature": {
      "label": "Unbounded plateau",
      "description": "Long organ tones and widely spaced glass notes reveal the motif at four times the civic duration.",
      "keywords": [
        "recursive",
        "crystalline",
        "resonant"
      ],
      "lead": "glass",
      "bass": "sub",
      "pad": "organ",
      "drums": "metal",
      "texture": "none",
      "brightness": 0.48,
      "space": 0.9,
      "grit": 0.03,
      "density": 0.18
    },
    "city": {
      "label": "Resonant courts",
      "description": "Short glass phrases answer measured low pulses while occasional recorded crystal and bell impacts mark larger cycles.",
      "keywords": [
        "recursive",
        "crystalline",
        "resonant"
      ],
      "lead": "glass",
      "bass": "round",
      "pad": "organ",
      "drums": "metal",
      "texture": "none",
      "brightness": 0.65,
      "space": 0.65,
      "grit": 0.06,
      "density": 0.38
    },
    "transition": {
      "curve": "equal-power",
      "description": "Both arrangements share a 32-bar harmonic cycle and run continuously; moving inward reveals the compact civic recursion while the plateau\u2019s longer echoes recede."
    }
  }
}