diff --git a/docs/plan/level-assets.md b/docs/plan/level-assets.md
index d8d5403..2677305 100644
--- a/docs/plan/level-assets.md
+++ b/docs/plan/level-assets.md
@@ -1693,3 +1693,39 @@ all 27 levels.
 
 What is still not named: what any of the four header words *means*, and how the
 level-specific tail is structured. The module reports them as fields.
+
+### moby_anim: the instance-table hypothesis is out
+
+`moby_anim` was the one post-shrub chunk type with a concrete reason to exist --
+an instance table would have to scale with the level's moby class count, so
+comparing per-type record counts against that count was the obvious test.
+
+**It fails, and the way it fails is itself the result: per-type record counts are
+level-independent.** The same types report the same counts on every level tried:
+
+    type_id     level0  level1  level2  level3
+    0x007d7ec438   90      90      90      90
+    0x00d3d8c4a9   90      90      90      90
+    0x00429ec43d   77      77      77      77
+    0x0053c8c4aa   77      77      77      77
+    0x007626c4a4   50      50      50      50
+    0x00fb88c462   47      47      47      47
+
+Across all 27 levels there are 77 distinct chunk types, the largest at 2,430
+records total -- which is exactly 90 x 27.
+
+**What that rules out.** Nothing in this chunk set is a per-moby-class instance
+table, because those counts would vary by level the way the moby class counts do.
+So whatever holds moby animation data is either keyed by something other than the
+class count, or it is not among these chunk types.
+
+**Also visible: the types pair up.** 0x007d7ec438 and 0x00d3d8c4a9 both report 90
+on every level; 0x00429ec43d and 0x0053c8c4aa both report 77. Two chunk types
+carrying identical, constant record counts on every level is a signature of two
+views of the same fixed table -- one indexed one way and one another -- rather
+than two independent tables that happen to agree.
+
+**Still open.** The pairings are described but not explained, and no type has been
+named. The Moby class-ID enrichment from earlier stands separately: 9,493 hits
+against 246.1 expected is real, and the class arrays are contiguous per type, but
+that identifies *where classes are referenced*, not which chunk is `moby_anim`.