diff --git a/assets/pixel-art/milestone-koi-pond.png b/assets/pixel-art/milestone-koi-pond.png
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diff --git a/demos/milestone-koi-pond-demo.mp4 b/demos/milestone-koi-pond-demo.mp4
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diff --git a/scripts/generate_milestone_koi_pixel_art.py b/scripts/generate_milestone_koi_pixel_art.py
new file mode 100644
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+++ b/scripts/generate_milestone_koi_pixel_art.py
@@ -0,0 +1,201 @@
+#!/usr/bin/env python3
+"""Generate the milestone koi pond pixel-art bounty asset."""
+
+from __future__ import annotations
+
+import struct
+import zlib
+from pathlib import Path
+
+
+WIDTH = 128
+HEIGHT = 128
+OUT = Path("assets/pixel-art/milestone-koi-pond.png")
+
+PALETTE = {
+    "ink": (18, 27, 35),
+    "deep": (18, 49, 56),
+    "water": (30, 92, 96),
+    "water_hi": (45, 130, 123),
+    "mint": (107, 184, 155),
+    "foam": (170, 226, 198),
+    "stone": (104, 126, 132),
+    "stone_hi": (157, 178, 174),
+    "stone_shadow": (57, 74, 82),
+    "card": (223, 229, 210),
+    "card_dark": (145, 154, 141),
+    "banana": (245, 198, 67),
+    "banana_hi": (255, 229, 118),
+    "orange": (217, 117, 62),
+    "coral": (225, 92, 86),
+    "leaf": (58, 143, 83),
+    "leaf_hi": (102, 188, 105),
+    "pink": (231, 149, 176),
+    "night": (12, 18, 28),
+}
+
+
+def new_canvas(color: tuple[int, int, int]) -> list[list[tuple[int, int, int]]]:
+    return [[color for _ in range(WIDTH)] for _ in range(HEIGHT)]
+
+
+def set_px(img, x: int, y: int, color: tuple[int, int, int]) -> None:
+    if 0 <= x < WIDTH and 0 <= y < HEIGHT:
+        img[y][x] = color
+
+
+def rect(img, x: int, y: int, w: int, h: int, color: tuple[int, int, int]) -> None:
+    for yy in range(y, y + h):
+        for xx in range(x, x + w):
+            set_px(img, xx, yy, color)
+
+
+def ellipse(img, cx: int, cy: int, rx: int, ry: int, color: tuple[int, int, int]) -> None:
+    rxs = rx * rx
+    rys = ry * ry
+    lim = rxs * rys
+    for yy in range(cy - ry, cy + ry + 1):
+        for xx in range(cx - rx, cx + rx + 1):
+            if ((xx - cx) ** 2) * rys + ((yy - cy) ** 2) * rxs <= lim:
+                set_px(img, xx, yy, color)
+
+
+def line(img, x0: int, y0: int, x1: int, y1: int, color: tuple[int, int, int]) -> None:
+    dx = abs(x1 - x0)
+    dy = -abs(y1 - y0)
+    sx = 1 if x0 < x1 else -1
+    sy = 1 if y0 < y1 else -1
+    err = dx + dy
+    while True:
+        set_px(img, x0, y0, color)
+        if x0 == x1 and y0 == y1:
+            break
+        e2 = 2 * err
+        if e2 >= dy:
+            err += dy
+            x0 += sx
+        if e2 <= dx:
+            err += dx
+            y0 += sy
+
+
+def outline_rect(img, x: int, y: int, w: int, h: int, color: tuple[int, int, int]) -> None:
+    rect(img, x, y, w, 1, color)
+    rect(img, x, y + h - 1, w, 1, color)
+    rect(img, x, y, 1, h, color)
+    rect(img, x + w - 1, y, 1, h, color)
+
+
+def add_ripples(img) -> None:
+    rings = [
+        (32, 39, 12, 4),
+        (57, 54, 14, 4),
+        (83, 69, 15, 5),
+        (55, 101, 20, 6),
+        (95, 93, 15, 5),
+    ]
+    for cx, cy, rx, ry in rings:
+        for offset in (0, 2):
+            for x in range(cx - rx, cx + rx + 1, 2):
+                yy = cy + (((x - cx) * (x - cx) * ry) // max(rx * rx, 1)) - ry + offset
+                set_px(img, x, yy, PALETTE["water_hi"])
+                set_px(img, x, cy + (cy - yy) + offset, PALETTE["water_hi"])
+
+
+def add_work_cards(img) -> None:
+    cards = [
+        (15, 29, 21, 13, PALETTE["mint"]),
+        (40, 42, 22, 13, PALETTE["banana"]),
+        (67, 56, 22, 13, PALETTE["coral"]),
+        (92, 70, 22, 13, PALETTE["foam"]),
+    ]
+    for x, y, w, h, accent in cards:
+        rect(img, x + 2, y + 2, w, h, PALETTE["stone_shadow"])
+        rect(img, x, y, w, h, PALETTE["card"])
+        outline_rect(img, x, y, w, h, PALETTE["card_dark"])
+        rect(img, x + 3, y + 3, w - 6, 2, accent)
+        rect(img, x + 4, y + 7, w - 8, 1, PALETTE["card_dark"])
+        rect(img, x + 4, y + 10, w - 11, 1, PALETTE["card_dark"])
+    for start, end in [((36, 37), (40, 47)), ((62, 49), (67, 61)), ((89, 63), (92, 75))]:
+        line(img, start[0], start[1], end[0], end[1], PALETTE["foam"])
+
+
+def add_koi(img) -> None:
+    ellipse(img, 67, 92, 23, 10, PALETTE["orange"])
+    ellipse(img, 72, 90, 19, 8, PALETTE["banana"])
+    ellipse(img, 76, 88, 12, 5, PALETTE["banana_hi"])
+    ellipse(img, 48, 94, 8, 6, PALETTE["orange"])
+    line(img, 44, 88, 52, 94, PALETTE["orange"])
+    line(img, 45, 101, 52, 95, PALETTE["orange"])
+    ellipse(img, 72, 103, 9, 5, PALETTE["banana"])
+    ellipse(img, 77, 81, 7, 4, PALETTE["banana"])
+    rect(img, 90, 89, 2, 2, PALETTE["night"])
+    rect(img, 62, 87, 8, 3, PALETTE["coral"])
+    rect(img, 80, 96, 7, 3, PALETTE["coral"])
+    for x, y in [(58, 89), (67, 97), (78, 86), (85, 93)]:
+        set_px(img, x, y, PALETTE["foam"])
+
+
+def add_plants_and_fireflies(img) -> None:
+    for cx, cy in [(21, 89), (31, 99), (102, 103), (111, 43)]:
+        ellipse(img, cx, cy, 8, 4, PALETTE["leaf"])
+        ellipse(img, cx + 2, cy - 1, 4, 2, PALETTE["leaf_hi"])
+        rect(img, cx + 1, cy - 1, 2, 2, PALETTE["pink"])
+    for x, y in [(22, 23), (52, 28), (73, 39), (96, 54), (107, 66), (36, 68), (30, 51)]:
+        rect(img, x, y, 2, 2, PALETTE["banana_hi"])
+        set_px(img, x - 1, y, PALETTE["mint"])
+        set_px(img, x + 2, y + 1, PALETTE["mint"])
+
+
+def add_border_and_texture(img) -> None:
+    rect(img, 0, 0, WIDTH, 4, PALETTE["ink"])
+    rect(img, 0, HEIGHT - 4, WIDTH, 4, PALETTE["ink"])
+    rect(img, 0, 0, 4, HEIGHT, PALETTE["ink"])
+    rect(img, WIDTH - 4, 0, 4, HEIGHT, PALETTE["ink"])
+    rect(img, 5, 5, WIDTH - 10, 2, PALETTE["water_hi"])
+    rect(img, 5, HEIGHT - 7, WIDTH - 10, 2, PALETTE["water_hi"])
+    rect(img, 5, 5, 2, HEIGHT - 10, PALETTE["water_hi"])
+    rect(img, WIDTH - 7, 5, 2, HEIGHT - 10, PALETTE["water_hi"])
+    for y in range(8, HEIGHT - 8):
+        for x in range(8, WIDTH - 8):
+            if (x * 7 + y * 11) % 37 == 0:
+                set_px(img, x, y, PALETTE["deep"])
+            elif (x * 5 + y * 3) % 53 == 0:
+                set_px(img, x, y, PALETTE["water"])
+
+
+def write_png(path: Path, img) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    raw_rows = []
+    for row in img:
+        raw_rows.append(b"\x00" + b"".join(bytes(pixel) for pixel in row))
+    raw = b"".join(raw_rows)
+
+    def chunk(kind: bytes, data: bytes) -> bytes:
+        return (
+            struct.pack(">I", len(data))
+            + kind
+            + data
+            + struct.pack(">I", zlib.crc32(kind + data) & 0xFFFFFFFF)
+        )
+
+    png = b"\x89PNG\r\n\x1a\n"
+    png += chunk("IHDR".encode(), struct.pack(">IIBBBBB", WIDTH, HEIGHT, 8, 2, 0, 0, 0))
+    png += chunk("IDAT".encode(), zlib.compress(raw, 9))
+    png += chunk("IEND".encode(), b"")
+    path.write_bytes(png)
+
+
+def main() -> None:
+    img = new_canvas(PALETTE["water"])
+    add_border_and_texture(img)
+    add_ripples(img)
+    add_work_cards(img)
+    add_koi(img)
+    add_plants_and_fireflies(img)
+    write_png(OUT, img)
+    print(f"Wrote {OUT} ({WIDTH}x{HEIGHT})")
+
+
+if __name__ == "__main__":
+    main()