diff --git a/HISTORY.md b/HISTORY.md
index fd9e5a4a..5d1f31c2 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -20,6 +20,9 @@
 * **Translation Updates:**
     * German
 
+### 2021-02-12
+* blocks, threads, lists: distinguish between "transpose" (<3D) and "deep transpose"
+
 ### 2021-02-11
 * objects: rearranged the blocks in the lists category palette
 * lists: fixed list.reverse() to return a shallow copy instead of mutating the original
diff --git a/snap.html b/snap.html
index 085c7929..868b37f5 100755
--- a/snap.html
+++ b/snap.html
@@ -8,12 +8,12 @@
         <script src="src/morphic.js?version=2021-02-10"></script>
         <script src="src/symbols.js?version=2020-10-07"></script>
         <script src="src/widgets.js?version=2021-01-05"></script>
-        <script src="src/blocks.js?version=2021-02-09"></script>
-        <script src="src/threads.js?version=2021-02-10"></script>
+        <script src="src/blocks.js?version=2021-02-12"></script>
+        <script src="src/threads.js?version=2021-02-12"></script>
         <script src="src/objects.js?version=2021-02-11"></script>
         <script src="src/gui.js?version=2021-02-04"></script>
         <script src="src/paint.js?version=2020-05-17"></script>
-        <script src="src/lists.js?version=2021-02-11"></script>
+        <script src="src/lists.js?version=2021-02-12"></script>
         <script src="src/byob.js?version=2020-12-22"></script>
         <script src="src/tables.js?version=2020-10-06"></script>
         <script src="src/sketch.js?version=2020-07-13"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 2522b1cd..86ca7e42 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -158,7 +158,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2021-February-09';
+modules.blocks = '2021-February-12';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -471,6 +471,7 @@ SyntaxElementMorph.prototype.labelParts = {
             'dimensions' : ['dimensions'],
             'flatten' : ['flatten'],
             'transpose' : ['transpose'],
+            'deep transpose' : ['deep transpose'],
             'reverse' : ['reverse'],
             '~' : null,
             'lines' : ['lines'],
diff --git a/src/lists.js b/src/lists.js
index 738eef7e..c70f7392 100644
--- a/src/lists.js
+++ b/src/lists.js
@@ -63,7 +63,7 @@ MorphicPreferences, TableDialogMorph, SpriteBubbleMorph, SpeechBubbleMorph,
 TableFrameMorph, TableMorph, Variable, isSnapObject, Costume, contains, detect,
 ZERO, WHITE*/
 
-modules.lists = '2021-February-11';
+modules.lists = '2021-February-12';
 
 var List;
 var ListWatcherMorph;
@@ -572,13 +572,16 @@ List.prototype.flatten = function () {
 };
 
 List.prototype.transpose = function () {
-    // answer a 2D list where each item has turned into a row,
-    // convert atomic items into lists,
-    // fill ragged columns with atomic values, if any, or empty cells
-
     if (this.rank() > 2) {
         return this.strideTranspose();
     }
+    return this.transpose2D();
+};
+
+List.prototype.transpose2D = function () {
+    // answer a 2D list where each item has turned into a row,
+    // convert atomic items into lists,
+    // fill ragged columns with atomic values, if any, or empty cells
 
     var col, src, i,
         width = Math.max(this.width(), 1),
diff --git a/src/threads.js b/src/threads.js
index c5a734ad..71dea1c9 100644
--- a/src/threads.js
+++ b/src/threads.js
@@ -61,7 +61,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy, Map,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, BLACK,
 TableFrameMorph, ColorSlotMorph, isSnapObject, newCanvas, Symbol, SVG_Costume*/
 
-modules.threads = '2021-February-10';
+modules.threads = '2021-February-12';
 
 var ThreadManager;
 var Process;
@@ -1988,6 +1988,9 @@ Process.prototype.reportListAttribute = function (choice, list) {
     case 'flatten':
         return list instanceof List ? list.ravel() : new List([list]);
     case 'transpose':
+        this.assertType(list, 'list');
+        return list.transpose2D();
+    case 'deep transpose':
         this.assertType(list, 'list');
         return list.transpose();
     case 'reverse':