@@ -112,7 +112,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
   <a href="showcase/shipping-crate/"><img src="showcase/shipping-crate/preview.webp" width="24%" alt="Shipping crate: a wooden slat crate with iron corner brackets on a dark studio floor, warm wedge on the back wall" /></a>
   <a href="showcase/stone-well/"><img src="showcase/stone-well/preview.webp" width="24%" alt="Stone well: a round brick well with a shingled pyramid roof on posts, rope and bucket, on a dark studio floor" /></a>
   <a href="showcase/wooden-barrel/"><img src="showcase/wooden-barrel/preview.webp" width="24%" alt="Wooden barrel: a 20-stave wine-cask with a head of four boards, chord-lofted iron hoops, and a bung on a dark studio floor" /></a>
-  <a href="showcase/campfire/"><img src="showcase/campfire/preview.webp" width="24%" alt="Campfire: a two-course stone fire ring with a tripod of logs on a dark studio floor, warm wedge on the back wall" /></a>
+  <a href="showcase/campfire/"><img src="showcase/campfire/preview.webp" width="24%" alt="Campfire: a two-course ring of rounded fieldstones around a tripod of logs and glowing ash on a dark studio floor, warm wedge on the back wall" /></a>
   <a href="showcase/market-stall/"><img src="showcase/market-stall/preview.webp" width="24%" alt="Market stall: a timber frame with post feet, slatted counter, rafters, and a striped awning on a dark studio floor, warm wedge on the back wall" /></a>
   <a href="showcase/street-lantern/"><img src="showcase/street-lantern/preview.webp" width="24%" alt="Street lantern: an iron post with brass collars, a braced arm, and a muntined amber cage on a dark studio floor" /></a>
   <a href="showcase/treasure-chest/"><img src="showcase/treasure-chest/preview.webp" width="24%" alt="Treasure chest: a slatted wooden chest with iron bands, corner brackets, and an open lid on a dark studio floor" /></a>
@@ -145,7 +145,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 [`wooden-barrel`](showcase/wooden-barrel/) — procedural 20-stave wine-cask with boarded, croze-seated heads and chord-lofted hoops through the same pipeline. Falsifiers `--round-band` exits 18, `--one-piece-head` exits 17.
 
-[`campfire`](showcase/campfire/) — procedural cobble ring, logs, and ash through the same pipeline. Falsifier `--skip-decimate` exits 9.
+[`campfire`](showcase/campfire/) — procedural fieldstone ring, logs, and ash through the same pipeline. Falsifiers `--skip-decimate` exits 9, `--uniform-stones` exits 20.
 
 [`market-stall`](showcase/market-stall/) — procedural timber stall with striped awning and counter through the same pipeline. Falsifier `--skip-decimate` exits 9.
 
 
@@ -1,7 +1,8 @@
 # Campfire
 
 A showcase piece, not an example. Procedural campfire (two-course
-running-bond stone ring of 14 barrelled wedges, pit-floor cobbles, ash,
+running-bond ring of 14 rounded fieldstones per course, pit-floor
+cobbles, ash with embers,
 a kissing log tripod that overshoots a shared apex ring, floor logs,
 and charcoal) then the shipped pipeline: unique-cell UVs, Cycles
 high-to-low normal bake, LOD chain, convex collider, Unity glTF export.
@@ -26,25 +27,28 @@ materials, UVs, evaluated LOD, collider, or export file.
 
 | Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) |
 | --- | --- | --- |
-| Base triangles | 1400–3600 | 2200 / 2200 / 2200 |
-| LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 |
-| LOD2 ratio | 0.10–0.35 of base | 0.2200 / 0.2200 / 0.2200 |
-| Materials | exactly 3 distinct; ≥80 wood, ≥24 ash, ≥200 stone | 3 slots; 216 / 48 / 1304 |
+| Base triangles | 1400–3600 | 2760 / 2760 / 2760 |
+| LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.4993 |
+| LOD2 ratio | 0.10–0.35 of base | 0.2196 / 0.2196 / 0.2196 |
+| Materials | exactly 3 distinct; ≥80 wood, ≥24 ash, ≥200 stone | 3 slots; 216 / 48 / 1416 |
 | UVs | in `0..1`, AABB overlap ≤ 1e-5 | in range, overlap 0 |
-| Outer AABB | (0.807, 0.808, 0.404) m ± 0.015 | (0.8069, 0.8079, 0.4037), zmin 0 |
-| Collider tris | ≤ 360 | 198 |
-| Export | written, size > 0 | 206244 / 206244 / 206236 bytes |
+| Outer AABB | (0.807, 0.808, 0.404) m ± 0.015 | (0.8024, 0.8022, 0.4037), zmin 0 |
+| Collider tris | ≤ 360 | 162 |
+| Export | written, size > 0 | 231952 / 231952 / 231944 bytes |
 
 Base triangles dropped from **3616 to 2200** in the quality pass: the
 old piece stacked identical boxes with a mortar gap and a teepee that
 met at one point. The rebuild is two seated courses plus crossing
-sticks; hidden overlapping volume went away.
+sticks; hidden overlapping volume went away. The second pass took it to
+**2760**: each stone is now a lofted, chamfered lump instead of a
+four-sided wedge.
 
 DECIMATE COLLAPSE triangle counts are **not** guaranteed identical across
 series — the gate is a ratio band, not an exact count. Bake pixels are
 stochastic; the gate is `has_data` plus operator `FINISHED`, not
-byte-identity. Stone-width jitter uses fixed seed 17. glTF byte size
-differs by 8 B on 5.2.1.
+byte-identity. Stone-width jitter uses fixed seed 17; each stone's
+shape draws from its own seeded generator. glTF byte size differs on
+5.2.1.
 
 ### Hygiene
 
@@ -60,18 +64,40 @@ Recomputed from the generated mesh, not asserted about the script.
 | Coplanar disjoint face pairs | 0 | 0 |
 | Grounded: `zmin` | within 1e-4 of 0 | 0.0000 |
 | Named supports: 14 bottom stones | each `zmin` ≤ 0.001 | 14, stone_z 0.00000 |
-| Ring plan | 0.807 m dia × 0.156 m high ± 0.04 | 0.8074 × 0.1560 |
+| Ring plan | 0.807 m dia × 0.176 m high ± 0.04 | 0.8023 × 0.1759 |
+| **Stone variation** (exit 20) | per course, spread of stone outer radius, and of crown height on the top course, each ≥ 0.006 m | 0.01269 (smallest spread) |
 
 ### Joint fit and seat
 
 | Axis | Declared | Measured (all three) |
 | --- | --- | --- |
-| Teepee kiss (BVH nearest at caps) | ≤ 0.008 m | 0.00001 |
+| Teepee kiss (BVH nearest at caps) | ≤ 0.008 m | 0.00034 |
 | Course seat (upper zmin − lower zmax) | abs ≤ 0.004 m | 0.00000 |
 
+### Stones, wood and ash
+
+The ring was 28 identical curved bricks: flat tops, flat faces, one
+height, one grey. It read as a concrete kerb. Each stone is now a
+chamfered octagon section lofted along its span, swelling to a seeded
+belly mid-stone and pinched and capped at the ends, with a seeded
+radial offset and outer-face wobble. Top-course stones get a seeded
+domed crown. The beds stay flat, and the bottom course's crown stays at
+the bed height, so the upper course still seats (course seat 0.00000).
+The stated ring height rose from 0.156 to 0.176 m for the crowns.
+
+**Stone variation** asserts the ring is not one stone repeated.
+`--uniform-stones` gives every stone the same draw — each jitter at its
+upper bound, so the ring keeps the envelope of its widest seeded stone
+and only this budget fails (exit 20, spread 0.00000).
+
+Stone is isotropic mottling, speckle and pitting with a seeded tone per
+stone (`stone-archway`'s recipe, reading `PieceTone`); sticks and logs
+carry their own tone and grain along their axis; the ash has sparse
+ember glow. The temp `.glb` is removed after its size is measured.
+
 ### Falsifiers
 
-Each violates one named budget. All six were run on 4.5.11, 5.1.2 and
+Each violates one named budget. All seven were run on 4.5.11, 5.1.2 and
 5.2.1 and returned the same code on each.
 
 | Flag | Budget violated | Exit |
@@ -82,6 +108,7 @@ Each violates one named budget. All six were run on 4.5.11, 5.1.2 and
 | `--short-stones` | named bottom-course supports at Z=0 | 16 |
 | `--float-logs` | teepee kiss | 17 |
 | `--gap-courses` | course seat | 18 |
+| `--uniform-stones` | stone variation | 20 |
 
 ## Run
 
@@ -93,6 +120,7 @@ blender --background --python campfire.py -- --lift-z
 blender --background --python campfire.py -- --short-stones
 blender --background --python campfire.py -- --float-logs
 blender --background --python campfire.py -- --gap-courses
+blender --background --python campfire.py -- --uniform-stones
 blender --background --python campfire.py -- --output campfire.png
 ```
 
@@ -102,7 +130,7 @@ Smoke passes no flags.
 
 File-local. `9` is a valid check code. `10` is reserved for
 `gallery_framing.check_framing` on the `--output` path. `15`–`19` are the
-hygiene and joint-fit family.
+hygiene and joint-fit family; `20` is file-local.
 
 | Code | Meaning |
 | --- | --- |
@@ -126,3 +154,4 @@ hygiene and joint-fit family.
 | 17 | Joint fit: teepee kiss (`--float-logs`) |
 | 18 | Seat: course gap (`--gap-courses`) |
 | 19 | Ring diameter or height off the stated real-world size |
+| 20 | Stone variation: the ring stones are identical (`--uniform-stones`) |