PRE-REFINEMENTS

fable/stack/SPEC.md

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+# The Chamber as a Volume — acrylic stack spec & depth design
+
+A backlit, six-plane physical piece for the eufyMake E1: three acrylic sheets,
+printed front **and** back, spaced with air gaps over an LED panel. This is
+roadmap Phase 3 made literal — the scene model's per-track `z` and `age` stop
+being opacity tricks and become actual millimetres.
+
+## Physical stack (proposed — buy list at bottom)
+
+```
+viewer
+  ─ C-front   the hand: grease pencil, réseau, fiducials, header, scratches
+  ═ sheet C   3 mm clear cast acrylic
+  ─ C-back    near scatter: δ-ray curls, close cosmics
+      ~6 mm air gap
+  ─ B-front   THE EVENT: sharp beaded track cores
+  ═ sheet B   3 mm
+  ─ B-back    halation: the same tracks, blurred — real glow-behind-the-line
+      ~6 mm air gap
+  ─ A-front   history: older background events, sinking
+  ═ sheet A   3 mm
+  ─ A-back    the cause: pressure disk (CMYK-only → pure glow) + chamber optics
+      ~12 mm gap
+  ▤ diffuser  frosted acrylic 2–3 mm (kills LED hotspots)
+  ▦ LED panel A3 slim light pad
+```
+
+Plane depths (A-back = 0): 0 / 3 / 9 / 12 / 18 / 21 mm — two depth scales:
+3 mm *within* a sheet (fine parallax: halation, moiré) and 9 mm *between*
+sheets (coarse parallax: cause → event → hand).
+
+**The depth story is causal, not just spatial**: deepest plane is the cause
+(the pressure wave, pure transmitted light), then history, then the halation,
+then the event itself, then the debris flying toward you, and finally — on the
+front glass, where scanners actually wrote — the human hand measuring it all.
+Parallax reads as *interpretation floating above evidence*.
+
+## Sheet & print geometry
+
+- Sheet: 330 × 420 mm (E1 full bed, A3+), portrait. 3 mm clear cast acrylic,
+  gloss both faces.
+- Art square: 300 × 300 mm, centred horizontally (15 mm margins), top edge at
+  y = 20 mm. Zone below (y = 320–420) carries film furniture / data box /
+  caption on C-front only; other sheets stay clear there (light spills through
+  — the plate floats in a lit void).
+- Corner mounting holes 5 mm ∅ at 8 mm insets, all sheets + diffuser, for M4
+  nylon standoffs (3 mm + 6 mm + 6 mm spacer stacking, or threaded rod with
+  nuts as spacers).
+- Registration: every plane file carries corner crosses at the same four
+  coordinates just outside the art square; back-face files are **mirrored** at
+  export so they read correctly through the sheet.
+
+## White-ink logic (backlit grammar)
+
+| zone | channels | lit result |
+|---|---|---|
+| clear acrylic | none | pure light |
+| glow elements (disk, halation, deep tracks) | CMYK only | stained-glass — light pours through colour |
+| focal ink (event cores, grease pencil, furniture) | CMYK + white underlay | holds density against the panel — reads as ink |
+| blocking (none in v1) | white + black | opaque |
+
+Rule of thumb: **depth = transparency**. The deeper the plane, the less white
+ink; the front glass is the most "solid" ink. The disk gets *zero* white — lit,
+it becomes a light source (the laser-interference reference lives here, later).
+
+## Pipeline
+
+```
+plan (fable/stack/plans/*.mjs)
+  → node tools/stack-render.mjs <plan>          per-plane SVGs + manifest.json
+  → fable/stack/simulator.html?c=<id>           parallax + backlight art-direction
+  → [next] tools/stack-export.mjs               print masters: mirrored backs,
+                                                white-ink masks, A3 layout @ true scale
+```
+
+`src/render/stack.js` splits one generated scene into per-plane sub-scenes
+(selectors: track kind / z band / age band; disk, optics, damage, media,
+fiducials, header as flags) and renders each through the untouched `renderSVG`
+with `transparentPaper`. Bloom/core pairs use the *same* track selector so
+bubble positions are identical on both faces (same filtered list → same salted
+draws) — keep `density`/`size` equal within a pair.
+
+Per-plane renders set `depth`/`aging` low: the physical stack now *is* the
+depth model; double-encoding it as opacity would fight the medium.
+
+## Calibration coupon (print before the hero)
+
+One A5 sheet, double-sided: white-ink step wedge (0/25/50/75/100%, single +
+double pass) · the same δ-ray at three white levels · CMYK-only vs CMYK+white
+swatch pair · front/back registration cross · 6 pt / 8 pt mono type both faces.
+Judge **lit on the panel**, not in hand.
+
+## Buy list (if starting from zero)
+
+- 3× cast clear acrylic 330 × 420 × 3 mm (+1 spare), protective film both sides
+- 1× frosted/opal acrylic 330 × 420 × 2–3 mm (diffuser)
+- A3 slim LED light panel (dimmable if possible)
+- M4 nylon standoff kit (assorted 3/6/12 mm) or 4× M4 threaded rod + nuts
+- IPA + lint-free cloths; adhesion promoter if the E1 profile recommends it

fable/stack/candidates/01-event-volume/manifest.json

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+{
+  "id": "01-event-volume",
+  "title": "The Event, Suspended",
+  "seed": "LAMBDA-2648",
+  "geometry": {
+    "thickness": 3,
+    "gap": 6
+  },
+  "planes": [
+    {
+      "file": "plane-00-A-back.svg",
+      "sheet": "A",
+      "face": "back",
+      "zmm": 0,
+      "label": "the cause — disk body + chamber optics"
+    },
+    {
+      "file": "plane-01-A-back.svg",
+      "sheet": "A",
+      "face": "back",
+      "zmm": 0,
+      "label": "the cause — disk granular texture"
+    },
+    {
+      "file": "plane-02-A-front.svg",
+      "sheet": "A",
+      "face": "front",
+      "zmm": 3,
+      "label": "history — older events sink"
+    },
+    {
+      "file": "plane-03-B-back.svg",
+      "sheet": "B",
+      "face": "back",
+      "zmm": 9,
+      "label": "halation — the trigger blooms behind itself"
+    },
+    {
+      "file": "plane-04-B-front.svg",
+      "sheet": "B",
+      "face": "front",
+      "zmm": 12,
+      "label": "the event — sharp beaded cores"
+    },
+    {
+      "file": "plane-05-C-back.svg",
+      "sheet": "C",
+      "face": "back",
+      "zmm": 18,
+      "label": "near scatter — δ-curls lift toward the eye"
+    },
+    {
+      "file": "plane-06-C-front.svg",
+      "sheet": "C",
+      "face": "front",
+      "zmm": 21,
+      "label": "the hand — grease pencil on the glass"
+    }
+  ]
+}

fable/stack/candidates/02-palimpsest/manifest.json

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+{
+  "id": "02-palimpsest",
+  "title": "Palimpsest",
+  "seed": "KAON-0088",
+  "geometry": {
+    "thickness": 3,
+    "gap": 6
+  },
+  "planes": [
+    {
+      "file": "plane-00-A-back.svg",
+      "sheet": "A",
+      "face": "back",
+      "zmm": 0,
+      "label": "deep time — oldest exposures + the chamber"
+    },
+    {
+      "file": "plane-01-A-front.svg",
+      "sheet": "A",
+      "face": "front",
+      "zmm": 3,
+      "label": "earlier cycle"
+    },
+    {
+      "file": "plane-02-B-back.svg",
+      "sheet": "B",
+      "face": "back",
+      "zmm": 9,
+      "label": "moments ago"
+    },
+    {
+      "file": "plane-03-B-back.svg",
+      "sheet": "B",
+      "face": "back",
+      "zmm": 9,
+      "label": "the pressure wave — body + texture"
+    },
+    {
+      "file": "plane-04-B-back.svg",
+      "sheet": "B",
+      "face": "back",
+      "zmm": 9,
+      "label": "pressure-wave grain"
+    },
+    {
+      "file": "plane-05-B-front.svg",
+      "sheet": "B",
+      "face": "front",
+      "zmm": 12,
+      "label": "NOW — the trigger, all kinds, sharp"
+    },
+    {
+      "file": "plane-06-C-back.svg",
+      "sheet": "C",
+      "face": "back",
+      "zmm": 18,
+      "label": "still in flight — δ-debris of now"
+    },
+    {
+      "file": "plane-07-C-front.svg",
+      "sheet": "C",
+      "face": "front",
+      "zmm": 21,
+      "label": "after — the hand, the furniture, the wear"
+    }
+  ]
+}

fable/stack/candidates/02-palimpsest/plane-07-C-front.svg

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+<g fill="#1c1814" font-family="'JetBrains Mono', monospace"><text x="36" y="52" font-size="15" fill-opacity="0.62">GARGAMELLE · CERN</text><text x="36" y="74" font-size="13" fill-opacity="0.5">SEED KAON-0088</text><text x="1364" y="1345" font-size="14" text-anchor="end" fill-opacity="0.58">PLATE 163</text><text x="1364" y="1364" font-size="14" text-anchor="end" fill-opacity="0.58">EXPOSED 1971.06.13</text></g>
+</g>
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+<rect x="38.0" y="38.0" width="1324.0" height="1324.0" fill="none" stroke="#1c1814" stroke-opacity="0.5" stroke-width="2.8"/><rect x="14.7" y="65.5" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="65.5" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="219.8" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="219.8" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="374.2" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="374.2" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="528.5" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="528.5" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="682.9" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="682.9" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="837.2" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="837.2" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="991.6" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="991.6" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="1145.9" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="1145.9" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="14.7" y="1300.3" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><rect x="1366.1" y="1300.3" width="19.2" height="34.3" rx="5.6" fill="#faf8f0" fill-opacity="0.7" stroke="#1c1814" stroke-opacity="0.4" stroke-width="1.4"/><g fill="#1c1814" font-family="'JetBrains Mono', monospace"><text x="58.6" y="700.0" font-size="10" fill-opacity="0.45" text-anchor="middle" transform="rotate(-90 58.6 700.0)">KODAK  SAFETY  FILM</text><text x="82.6" y="1248.8" font-size="13" fill-opacity="0.5">ROLL 627</text><text x="82.6" y="1265.6" font-size="13" fill-opacity="0.5">FRAME 163</text><text x="82.6" y="1282.4" font-size="13" fill-opacity="0.5">1971.06.13</text></g><g stroke="#9c1e1e" fill="#9c1e1e" stroke-linecap="round" stroke-linejoin="round"><path d="M 1142.9 886.3 L 1140.6 890.2 L 1136.5 891.9 L 1133.9 896.9 L 1130.0 900.7 L 1125.0 901.9 L 1120.0 898.3 L 1115.0 900.6 L 1111.0 896.4 L 1106.5 895.4 L 1101.5 894.9 L 1097.6 892.0 L 1094.0 888.7 L 1091.2 884.8 L 1089.5 880.4 L 1088.1 875.9 L 1089.5 870.9 L 1086.8 867.0 L 1085.3 862.5 L 1087.2 858.2 L 1082.1 852.1 L 1088.7 849.3 L 1088.1 843.6 L 1088.7 837.7 L 1092.5 834.0 L 1099.5 834.8 L 1104.2 833.8 L 1106.8 828.3 L 1110.8 823.4 L 1116.5 827.6 L 1121.2 827.1 L 1126.2 826.2 L 1131.6 825.5 L 1133.6 833.3 L 1137.2 835.6 L 1140.9 837.9 L 1145.8 839.3 L 1150.6 841.7 L 1151.3 846.9 L 1154.8 850.7 L 1155.0 855.7 L 1157.0 860.4 L 1154.1 865.2 L 1152.5 869.6 L 1151.5 874.0 L 1152.6 879.7 L 1144.9 880.4 L 1144.8 886.0 L 1143.6 891.7 L 1134.9 887.5 L 1134.5 896.2 L 1128.8 894.5 L 1124.9 898.1" fill="none" stroke-opacity="0.85" stroke-width="1.68"/><path d="M 875.2 624.7 L 899.7 640.5 L 933.8 663.3 L 965.0 691.7 L 995.0 710.9 L 1037.6 729.5 L 1071.6 748.7 L 1097.6 777.1 L 1133.8 799.8 L 1166.6 822.1" fill="none" stroke-opacity="0.85" stroke-width="1.40"/><path d="M 1165.1 822.7 L 1145.0 818.6 M 1165.1 822.7 L 1154.1 805.4" fill="none" stroke-opacity="0.85" stroke-width="1.40"/><text x="1157.9" y="826.3" font-size="31" font-family="'Bradley Hand','Segoe Script','Comic Sans MS',cursive" fill-opacity="0.9" transform="rotate(-5.6 1157.9 826.3)">Nº 163</text></g>
+</g>
+</svg>

fable/stack/candidates/03-interference/manifest.json

@@ -0,0 +1,67 @@
+{
+  "id": "03-interference",
+  "title": "The Measurement Interferes",
+  "seed": "NEUTRINO-1973",
+  "geometry": {
+    "thickness": 3,
+    "gap": 6
+  },
+  "planes": [
+    {
+      "file": "plane-00-A-back.svg",
+      "sheet": "A",
+      "face": "back",
+      "zmm": 0,
+      "label": "the spectral disk — interference at the source"
+    },
+    {
+      "file": "plane-01-A-back.svg",
+      "sheet": "A",
+      "face": "back",
+      "zmm": 0,
+      "label": "the disk — granular spray"
+    },
+    {
+      "file": "plane-02-A-front.svg",
+      "sheet": "A",
+      "face": "front",
+      "zmm": 3,
+      "label": "the sea — sweepers, cosmics, history"
+    },
+    {
+      "file": "plane-03-B-back.svg",
+      "sheet": "B",
+      "face": "back",
+      "zmm": 9,
+      "label": "deep réseau — scaled +1.5%, moirés against the front grid"
+    },
+    {
+      "file": "plane-04-B-back.svg",
+      "sheet": "B",
+      "face": "back",
+      "zmm": 9,
+      "label": "halation — the trigger blooms"
+    },
+    {
+      "file": "plane-05-B-front.svg",
+      "sheet": "B",
+      "face": "front",
+      "zmm": 12,
+      "label": "the event — sharp"
+    },
+    {
+      "file": "plane-06-C-back.svg",
+      "sheet": "C",
+      "face": "back",
+      "zmm": 18,
+      "label": "δ-curls in flight"
+    },
+    {
+      "file": "plane-07-C-front.svg",
+      "sheet": "C",
+      "face": "front",
+      "zmm": 21,
+      "label": "front réseau + the hand — measurement on glass"
+    }
+  ]
+}

fable/stack/plans/01-event-volume.mjs

@@ -0,0 +1,48 @@
+/* Candidate 01 — THE EVENT, SUSPENDED
+   The purest depth thesis: causality back-to-front. The pressure
+   disk glows deepest (CMYK-only when printed — it becomes a light
+   source), history sinks behind the trigger, the trigger blooms on
+   B-back and cuts sharp on B-front (real halation across 3 mm of
+   acrylic), the δ-curls lift off toward the eye, and the scanner's
+   grease pencil floats on the front glass where hands actually wrote.
+   Palette: near-mono traces + one earned ember accent on the disk
+   (magentarise with saturation crushed; disk hue is immune). */
+export default {
+  id: '01-event-volume',
+  title: 'The Event, Suspended',
+  seed: 'LAMBDA-2648',
+  size: 1400,
+  geometry: { thickness: 3, gap: 6 },
+  params: {
+    palette: 'magentarise', saturation: 0.14,
+    diskHue: 0.055, diskSat: 0.88,            // ember — the one colour
+    primaries: 18, burst: 0.8, vdecay: 4,
+    bgEvents: 7, bgIntensity: 0.5, cosmics: 8, sweepers: 5,
+    deltaRate: 0.9, deltaTight: 0.9,
+    shock: true, diskBubbles: true, diskSoften: 1.2,
+    shockIntensity: 0.9, diskPressure: 0.55,
+    shockSize: 0.34, shockY: 0.52,
+    annotate: 0.7, annoWidth: 0.5, reseau: 0.4, filmEdge: true,
+    artifacts: 0.5, instrument: 0.45,
+  },
+  planes: [
+    { sheet: 'A', face: 'back', label: 'the cause — disk body + chamber optics',
+      disk: true, boundary: true, optics: true,
+      params: { diskBubbles: false, diskPressure: 0.85, diskSoften: 1.6 } },
+    { sheet: 'A', face: 'back', label: 'the cause — disk granular texture',
+      disk: true,
+      params: { diskBubbles: true }, fx: { opacity: 0.9 } },
+    { sheet: 'A', face: 'front', label: 'history — older events sink',
+      tracks: { age: [0.25, 1] },
+      fx: { blur: 1.6, opacity: 0.85 } },
+    { sheet: 'B', face: 'back', label: 'halation — the trigger blooms behind itself',
+      tracks: { age: [0, 0.25], kinds: ['primary', 'vdecay'] },
+      fx: { blur: 7, opacity: 0.5 } },
+    { sheet: 'B', face: 'front', label: 'the event — sharp beaded cores',
+      tracks: { age: [0, 0.25], kinds: ['primary', 'vdecay'] } },
+    { sheet: 'C', face: 'back', label: 'near scatter — δ-curls lift toward the eye',
+      tracks: { age: [0, 0.25], kinds: ['delta', 'cosmic', 'sweep'] } },
+    { sheet: 'C', face: 'front', label: 'the hand — grease pencil on the glass',
+      media: true, fiducials: true, header: true, damage: true },
+  ],
+};

fable/stack/plans/02-palimpsest.mjs

@@ -0,0 +1,47 @@
+/* Candidate 02 — PALIMPSEST
+   Depth as pure time, full mono: the chamber ran all night and the
+   stack is the exposure record. Oldest events deepest; each plane
+   forward is a later moment; the current trigger sits on B-front;
+   its δ-debris is still in flight on C-back; the hand arrives last,
+   on the front glass — the only "now" that outlived the event.
+   No colour anywhere: transmitted light does all the work. */
+export default {
+  id: '02-palimpsest',
+  title: 'Palimpsest',
+  seed: 'KAON-0088',
+  size: 1400,
+  geometry: { thickness: 3, gap: 6 },
+  params: {
+    palette: 'mono',
+    primaries: 16, burst: 0.75, vdecay: 3,
+    bgEvents: 11, bgIntensity: 0.75, cosmics: 10, sweepers: 6,
+    deltaRate: 0.85,
+    shock: true, diskBubbles: true, diskSoften: 1.0,
+    shockIntensity: 0.85, diskPressure: 0.4,
+    shockSize: 0.28, shockY: 0.55,
+    annotate: 0.5, annoWidth: 0.5, filmEdge: true,
+    artifacts: 0.6, instrument: 0.5,
+  },
+  planes: [
+    { sheet: 'A', face: 'back', label: 'deep time — oldest exposures + the chamber',
+      tracks: { age: [0.6, 1] }, boundary: true, optics: true,
+      fx: { blur: 1.4, opacity: 0.9 } },
+    { sheet: 'A', face: 'front', label: 'earlier cycle',
+      tracks: { age: [0.35, 0.6] },
+      fx: { blur: 0.8, opacity: 0.95 } },
+    { sheet: 'B', face: 'back', label: 'moments ago',
+      tracks: { age: [0.12, 0.35] } },
+    { sheet: 'B', face: 'back', label: 'the pressure wave — body + texture',
+      disk: true,
+      params: { diskBubbles: false, diskPressure: 0.7 } },
+    { sheet: 'B', face: 'back', label: 'pressure-wave grain',
+      disk: true,
+      params: { diskBubbles: true }, fx: { opacity: 0.85 } },
+    { sheet: 'B', face: 'front', label: 'NOW — the trigger, all kinds, sharp',
+      tracks: { age: [0, 0.12], kinds: ['primary', 'vdecay'] } },
+    { sheet: 'C', face: 'back', label: 'still in flight — δ-debris of now',
+      tracks: { age: [0, 0.12], kinds: ['delta'] } },
+    { sheet: 'C', face: 'front', label: 'after — the hand, the furniture, the wear',
+      media: true, fiducials: true, header: true, damage: true },
+  ],
+};

fable/stack/plans/03-interference.mjs

@@ -0,0 +1,51 @@
+/* Candidate 03 — THE MEASUREMENT INTERFERES
+   The instrument becomes phenomenon: the réseau measuring grid is
+   printed TWICE — once deep (B-back, scaled 1.5%), once on the
+   front glass — so the act of measurement moirés against itself as
+   the viewer moves. The disk goes deepest with a full spectral
+   sunburst (iridescent striations, CMYK-only glow when printed):
+   the interference-pattern reference, arrived at from inside the
+   project's own vocabulary. Mono traces; the spectrum is earned by
+   the physics feature that IS interference. */
+export default {
+  id: '03-interference',
+  title: 'The Measurement Interferes',
+  seed: 'NEUTRINO-1973',
+  size: 1400,
+  geometry: { thickness: 3, gap: 6 },
+  params: {
+    palette: 'mono',
+    primaries: 14, burst: 0.7, vdecay: 3,
+    bgEvents: 5, bgIntensity: 0.45, cosmics: 7, sweepers: 6,
+    deltaRate: 0.8,
+    shock: true, diskBubbles: false, diskSoften: 0.6,
+    shockIntensity: 0.95, diskPressure: 0.5,
+    diskSpectrum: 0.85, shockStriations: 1.0,
+    shockSize: 0.38, shockY: 0.5, shockX: 0,
+    annotate: 0.7, annoWidth: 0.5, reseau: 0.85, filmEdge: true,
+    artifacts: 0.45, instrument: 0.4,
+  },
+  planes: [
+    { sheet: 'A', face: 'back', label: 'the spectral disk — interference at the source',
+      disk: true, boundary: true, optics: true,
+      params: { diskSoften: 1.2, diskPressure: 0.8 } },
+    { sheet: 'A', face: 'back', label: 'the disk — granular spray',
+      disk: true,
+      params: { diskBubbles: true }, fx: { opacity: 0.8 } },
+    { sheet: 'A', face: 'front', label: 'the sea — sweepers, cosmics, history',
+      tracks: { age: [0.2, 1] },
+      fx: { blur: 1.4, opacity: 0.85 } },
+    { sheet: 'B', face: 'back', label: 'deep réseau — scaled +1.5%, moirés against the front grid',
+      media: { reseau: true },
+      fx: { scale: 1.015 } },
+    { sheet: 'B', face: 'back', label: 'halation — the trigger blooms',
+      tracks: { age: [0, 0.2], kinds: ['primary', 'vdecay'] },
+      fx: { blur: 5, opacity: 0.55 } },
+    { sheet: 'B', face: 'front', label: 'the event — sharp',
+      tracks: { age: [0, 0.2], kinds: ['primary', 'vdecay'] } },
+    { sheet: 'C', face: 'back', label: 'δ-curls in flight',
+      tracks: { age: [0, 0.2], kinds: ['delta'] } },
+    { sheet: 'C', face: 'front', label: 'front réseau + the hand — measurement on glass',
+      media: true, fiducials: true, header: true, damage: true },
+  ],
+};

fable/stack/simulator.html

@@ -0,0 +1,129 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>stack simulator</title>
+<style>
+  :root { color-scheme: dark; }
+  * { box-sizing: border-box; margin: 0; }
+  body { background:#0c0b09; color:#b8b0a0; font:12px/1.5 'JetBrains Mono',ui-monospace,monospace;
+         min-height:100vh; display:flex; }
+  #panel { width:250px; padding:16px; border-right:1px solid #26221c; flex-shrink:0; }
+  #panel h1 { font-size:13px; color:#e0d8c8; font-weight:600; margin-bottom:2px; }
+  #panel .sub { color:#6d6558; margin-bottom:14px; }
+  #panel label { display:block; margin:10px 0 2px; color:#8d8574; }
+  #panel input[type=range] { width:100%; accent-color:#c9803a; }
+  .plane-row { display:flex; gap:6px; align-items:baseline; margin:3px 0; cursor:pointer; }
+  .plane-row .z { color:#5d5548; width:44px; flex-shrink:0; }
+  .plane-row.off { opacity:0.35; }
+  button { background:#1c1914; color:#c9b98c; border:1px solid #3a342a; padding:5px 10px;
+           font:inherit; cursor:pointer; margin:2px 2px 0 0; }
+  button.on { background:#c9803a; color:#14100a; border-color:#c9803a; }
+  #stagewrap { flex:1; display:flex; align-items:center; justify-content:center;
+               perspective:1400px; overflow:hidden; }
+  #stage { position:relative; transform-style:preserve-3d; }
+  #stage img { position:absolute; left:0; top:0; width:100%; height:100%; user-select:none;
+               -webkit-user-drag:none; }
+  /* the light table — painted on the WRAP, not the stage: with preserve-3d a
+     stage background sits at z=0 and would occlude planes behind it */
+  #stagewrap.lit #light  { background:radial-gradient(circle at 50% 46%, #fffdf4 0%, #f4ecd8 55%, #d8cdb2 100%); }
+  #stagewrap.unlit #light{ background:#b9b2a2; }
+  #stagewrap.unlit #stage img { filter:brightness(0.94) contrast(0.96); }
+  #light { position:absolute; inset:0; transform:translateZ(-400px) scale(1.6); }
+  #hint { position:fixed; right:14px; bottom:10px; color:#4d4639; }
+</style>
+</head>
+<body>
+<div id="panel">
+  <h1 id="title">—</h1>
+  <div class="sub" id="seed">—</div>
+  <div>
+    <button id="bl" class="on">backlit</button>
+    <button id="spin">auto-orbit</button>
+  </div>
+  <label>depth exaggeration <span id="zv"></span></label>
+  <input type="range" id="zscale" min="0" max="14" step="0.5" value="5">
+  <label>tilt range <span id="tv"></span></label>
+  <input type="range" id="tilt" min="0" max="24" step="1" value="10">
+  <label style="margin-top:14px">planes (click to toggle)</label>
+  <div id="planes"></div>
+</div>
+<div id="stagewrap" class="lit"><div id="stage"><div id="light"></div></div></div>
+<div id="hint">move mouse to parallax · ?c=&lt;candidate-id&gt;</div>
+<script>
+const q = new URLSearchParams(location.search);
+const cid = q.get('c') || '01-event-volume';
+const stage = document.getElementById('stage');
+const SZ = Math.min(innerHeight, innerWidth - 250) - 40;
+stage.style.width = stage.style.height = SZ + 'px';
+
+let planes = [], rx = 0, ry = 0, zs = 5, spin = false, t0 = performance.now();
+
+fetch(`candidates/${cid}/manifest.json`).then(r => r.json()).then(m => {
+  document.getElementById('title').textContent = m.title;
+  document.getElementById('seed').textContent = `seed ${m.seed} · ${m.planes.length} planes`;
+  const list = document.getElementById('planes');
+  m.planes.forEach((p, i) => {
+    const img = document.createElement('img');
+    img.src = `candidates/${cid}/${p.file}`;
+    stage.appendChild(img);
+    const row = document.createElement('div');
+    row.className = 'plane-row';
+    row.innerHTML = `<span class="z">${p.zmm}mm</span><span>${p.sheet}-${p.face} · ${p.label}</span>`;
+    row.onclick = () => { img.style.display = img.style.display === 'none' ? '' : 'none';
+                          row.classList.toggle('off'); };
+    list.appendChild(row);
+    planes.push({ img, zmm: p.zmm });
+  });
+  layout();
+});
+
+function layout() {
+  const mid = planes.length ? planes.reduce((s, p) => s + p.zmm, 0) / planes.length : 0;
+  for (const p of planes)
+    p.img.style.transform = `translateZ(${(p.zmm - mid) * zs}px)`;
+  stage.style.transform = `rotateX(${rx}deg) rotateY(${ry}deg)`;
+}
+
+const zEl = document.getElementById('zscale'), tEl = document.getElementById('tilt');
+const zv = document.getElementById('zv'), tv = document.getElementById('tv');
+function syncLabels(){ zv.textContent = `×${zEl.value}`; tv.textContent = `±${tEl.value}°`; }
+syncLabels();
+zEl.oninput = () => { zs = +zEl.value; syncLabels(); layout(); };
+tEl.oninput = syncLabels;
+
+const staticMode = q.get('static') !== null;
+addEventListener('mousemove', e => {
+  if (spin || staticMode) return;
+  const T = +tEl.value;
+  ry = ((e.clientX / innerWidth) - 0.5) * 2 * T;
+  rx = -((e.clientY / innerHeight) - 0.5) * 2 * T;
+  layout();
+});
+document.getElementById('bl').onclick = function () {
+  const wrap = document.getElementById('stagewrap');
+  const lit = wrap.classList.toggle('lit');
+  wrap.classList.toggle('unlit', !lit);
+  this.classList.toggle('on', lit);
+};
+document.getElementById('spin').onclick = function () {
+  spin = !spin; this.classList.toggle('on', spin);
+  if (spin) requestAnimationFrame(orbit);
+};
+function orbit(t) {
+  if (!spin) return;
+  const T = +tEl.value;
+  ry = Math.sin((t - t0) / 1400) * T;
+  rx = Math.cos((t - t0) / 2300) * T * 0.4;
+  layout();
+  requestAnimationFrame(orbit);
+}
+// static pose for headless screenshots: ?static=ry,rx
+if (staticMode) {
+  const [a, b] = (q.get('static') || '').split(',').map(Number);
+  ry = isFinite(a) ? a : 8; rx = isFinite(b) ? b : -4;
+  setTimeout(layout, 300);
+}
+</script>
+</body>
+</html>

src/render/stack.js

@@ -0,0 +1,112 @@
+/* ============================================================
+   stack.js — split one scene across the printable planes of a
+   physical acrylic stack (front + back of several sheets, air
+   gaps, backlit). The scene model's per-track z and age stop
+   being opacity tricks and become actual millimetres.
+
+   A PLAN describes the piece:
+     { id, seed, size, geometry:{thickness,gap}, params:{...},
+       planes: [ { sheet:'A', face:'back', label,
+                   tracks: false | true | {kinds, z:[lo,hi], age:[lo,hi]},
+                   disk, boundary, optics, damage,        // flags
+                   media: false | true | {reseau,grease,film,splice},
+                   fiducials, header,                     // flags
+                   params: {...per-plane overrides},
+                   fx: { blur, opacity, scale } }, ... ] }
+
+   The scene is generated ONCE from the merged params; each plane
+   renders a filtered copy through the untouched renderSVG with
+   transparentPaper (the backlight is the paper). Bloom/core face
+   pairs must use IDENTICAL track selectors and equal density/size
+   so their salted bubble draws match — same filtered list, same
+   positions; only fx differ.
+
+   Per-plane depth/aging default LOW: the physical stack now
+   carries depth; double-encoding it as opacity fights the medium.
+   ============================================================ */
+import { generateScene } from '../scene/scene.js';
+import { paramsFromSeed } from '../scene/params.js';
+import { renderSVG } from './svgVector.js';
+
+const inRange = (v, r) => !r || (v >= r[0] && v <= r[1]);
+
+function filterTracks(tracks, sel) {
+  if (!sel) return [];
+  if (sel === true) return tracks;
+  return tracks.filter(t =>
+    (!sel.kinds || sel.kinds.includes(t.kind)) &&
+    inRange(t.z ?? 0, sel.z) &&
+    inRange(t.age ?? 0, sel.age));
+}
+
+function filterMedia(media, sel) {
+  if (!media || !sel) return null;
+  if (sel === true) return media;
+  return {
+    reseau: sel.reseau ? media.reseau : null,
+    grease: sel.grease ? media.grease : [],
+    film: sel.film ? media.film : null,
+    splice: sel.splice ? media.splice : null,
+  };
+}
+
+/* wrap a rendered plane in optional blur / opacity / centre-scale
+   (blur is in u = px per 1000; scale is for deliberate moiré offsets) */
+function applyFx(svg, fx, size) {
+  const { blur = 0, opacity = 1, scale = 1 } = fx || {};
+  if (!blur && opacity === 1 && scale === 1) return svg;
+  const u = size / 1000, c = size / 2;
+  const filter = blur
+    ? `<filter id="planefx" x="-15%" y="-15%" width="130%" height="130%"><feGaussianBlur stdDeviation="${(blur * u).toFixed(2)}"/></filter>`
+    : '';
+  const g = `<defs>${filter}</defs><g${blur ? ' filter="url(#planefx)"' : ''}`
+    + `${opacity !== 1 ? ` opacity="${opacity}"` : ''}`
+    + `${scale !== 1 ? ` transform="translate(${c} ${c}) scale(${scale}) translate(${-c} ${-c})"` : ''}>`;
+  return svg.replace(/(<svg[^>]*>)/, `$1\n${g}`).replace(/<\/svg>\s*$/, '</g></svg>\n');
+}
+
+export function renderStack(plan) {
+  const base = { ...paramsFromSeed(plan.seed), ...(plan.params || {}), invert: true };
+  const scene = generateScene(base);
+  const size = plan.size || 1400;
+
+  const planes = plan.planes.map((plane) => {
+    const emit = [];
+    if (plane.disk) emit.push('disk');
+    if (plane.tracks || plane.optics || plane.damage || plane.boundary) emit.push('bubble');
+    if (plane.media || plane.fiducials || plane.header) emit.push('fiduciaries');
+
+    const ps = {
+      ...base,
+      transparentPaper: true, vign: 0,
+      showBoundary: !!plane.boundary,
+      showFiducials: !!plane.fiducials,
+      showHeader: !!plane.header,
+      depth: 0.15, aging: 0.2,          // the stack is the depth model now
+      emit,
+      ...(plane.params || {}),
+    };
+    const sc = {
+      ...scene,
+      tracks: filterTracks(scene.tracks, plane.tracks ?? false),
+      shock: plane.disk ? scene.shock : null,
+      instrument: plane.optics ? scene.instrument : null,
+      artifacts: plane.damage ? scene.artifacts : null,
+      media: filterMedia(scene.media, plane.media),
+    };
+    const svg = applyFx(renderSVG(sc, ps, size), plane.fx, size);
+    return { sheet: plane.sheet, face: plane.face, label: plane.label || '', svg };
+  });
+
+  return { plan, scene, planes };
+}
+
+/* physical z (mm) of each plane from stack geometry; sheet order = first
+   appearance in the plan (back of the stack first) */
+export function planeDepths(plan) {
+  const t = plan.geometry?.thickness ?? 3;
+  const g = plan.geometry?.gap ?? 6;
+  const sheets = [...new Set(plan.planes.map(p => p.sheet))];
+  return plan.planes.map(p =>
+    sheets.indexOf(p.sheet) * (t + g) + (p.face === 'front' ? t : 0));
+}

tools/stack-render.mjs

@@ -0,0 +1,33 @@
+#!/usr/bin/env node
+/* stack-render.mjs — render an acrylic-stack plan to per-plane SVGs.
+   usage: node tools/stack-render.mjs <plan.mjs> [outDir]
+   Writes plane-NN-<sheet>-<face>.svg + manifest.json for the simulator
+   (fable/stack/simulator.html?c=<id>). */
+import { mkdirSync, writeFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { pathToFileURL } from 'node:url';
+import { renderStack, planeDepths } from '../src/render/stack.js';
+
+const [planPath, outArg] = process.argv.slice(2);
+if (!planPath) { console.error('usage: node tools/stack-render.mjs <plan.mjs> [outDir]'); process.exit(1); }
+
+const plan = (await import(pathToFileURL(resolve(planPath)).href)).default;
+const outDir = resolve(outArg || `fable/stack/candidates/${plan.id}`);
+mkdirSync(outDir, { recursive: true });
+
+const { planes } = renderStack(plan);
+const zmm = planeDepths(plan);
+
+const manifest = {
+  id: plan.id, title: plan.title || plan.id, seed: plan.seed,
+  geometry: { thickness: plan.geometry?.thickness ?? 3, gap: plan.geometry?.gap ?? 6 },
+  planes: [],
+};
+planes.forEach((p, i) => {
+  const file = `plane-${String(i).padStart(2, '0')}-${p.sheet}-${p.face}.svg`;
+  writeFileSync(`${outDir}/${file}`, p.svg);
+  manifest.planes.push({ file, sheet: p.sheet, face: p.face, zmm: zmm[i], label: p.label });
+  console.log(`  ${file}  z=${zmm[i]}mm  ${p.label}`);
+});
+writeFileSync(`${outDir}/manifest.json`, JSON.stringify(manifest, null, 2));
+console.log(`→ ${outDir} (${planes.length} planes)`);