diff --git a/HISTORY.md b/HISTORY.md
index a7c6d78f..a9560b47 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,7 @@
 
 ## in development:
 * **New Features:**
+    * added selectors for sprites' bounding box (left, right, top, bottom) to MY dropdown
 * **Notable Changes:**
     * running STOP ALL now also toggles (pauses and resumes) all generic WHEN hat blocks (just like pressing the stop button)
 * **Notable Fixes:**
@@ -9,6 +10,9 @@
     * assert that dimensions given for STRETCH are finite numbers (avoid crash)
 * **Translation Updates:**
 
+### 2019-10-17
+* objects, blocks, threads: added selectors for sprites' bounding box (left, right, top, bottom) to MY dropdown
+
 ### 2019-10-16
 * new dev version
 * morphic: added "enableLinks" flag to text elements, off by default
diff --git a/snap.html b/snap.html
index 5e91fd7c..0142633e 100755
--- a/snap.html
+++ b/snap.html
@@ -6,9 +6,9 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-10-16"></script>
         <script type="text/javascript" src="src/widgets.js?version=2019-10-16"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-08-07"></script>
-        <script type="text/javascript" src="src/threads.js?version=2019-10-16"></script>
-        <script type="text/javascript" src="src/objects.js?version=2019-10-14"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-10-17"></script>
+        <script type="text/javascript" src="src/threads.js?version=2019-10-17"></script>
+        <script type="text/javascript" src="src/objects.js?version=2019-10-17"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-10-16"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/lists.js?version=2019-07-01"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 5b09fab3..70585c95 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-August-07';
+modules.blocks = '2019-October-17';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -8975,6 +8975,10 @@ InputSlotMorph.prototype.gettablesMenu = function () {
     dict['draggable?'] = ['draggable?'];
     dict.width = ['width'];
     dict.height = ['height'];
+    dict.left = ['left'];
+    dict.right = ['right'];
+    dict.top = ['top'];
+    dict.bottom = ['bottom'];
     dict['rotation style'] = ['rotation style'];
     dict['rotation x'] = ['rotation x'];
     dict['rotation y'] = ['rotation y'];
diff --git a/src/objects.js b/src/objects.js
index f4a6591a..df872d79 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph,  BooleanSlotMorph,
 localize, TableMorph, TableFrameMorph, normalizeCanvas, VectorPaintEditorMorph,
 HandleMorph, AlignmentMorph, Process, XML_Element, WorldMap*/
 
-modules.objects = '2019-October-14';
+modules.objects = '2019-October-17';
 
 var SpriteMorph;
 var StageMorph;
@@ -5575,6 +5575,8 @@ SpriteMorph.prototype.setPivot = function (worldCoordinate) {
     }
 };
 
+// SpriteMorph dimension getters
+
 SpriteMorph.prototype.xCenter = function () {
     var stage = this.parentThatIsA(StageMorph);
 
@@ -5599,6 +5601,54 @@ SpriteMorph.prototype.yCenter = function () {
     return this.center().y;
 };
 
+SpriteMorph.prototype.xLeft = function () {
+    var stage = this.parentThatIsA(StageMorph);
+
+    if (!stage && this.parent.grabOrigin) { // I'm currently being dragged
+        stage = this.parent.grabOrigin.origin;
+    }
+    if (stage) {
+        return (this.left() - stage.center().x) / stage.scale;
+    }
+    return this.left();
+};
+
+SpriteMorph.prototype.xRight = function () {
+    var stage = this.parentThatIsA(StageMorph);
+
+    if (!stage && this.parent.grabOrigin) { // I'm currently being dragged
+        stage = this.parent.grabOrigin.origin;
+    }
+    if (stage) {
+        return (this.right() - stage.center().x) / stage.scale;
+    }
+    return this.right();
+};
+ 
+SpriteMorph.prototype.yTop = function () {
+    var stage = this.parentThatIsA(StageMorph);
+
+    if (!stage && this.parent.grabOrigin) { // I'm currently being dragged
+        stage = this.parent.grabOrigin.origin;
+    }
+    if (stage) {
+        return (stage.center().y - this.top()) / stage.scale;
+    }
+    return this.top();
+};
+
+SpriteMorph.prototype.yBottom = function () {
+    var stage = this.parentThatIsA(StageMorph);
+
+    if (!stage && this.parent.grabOrigin) { // I'm currently being dragged
+        stage = this.parent.grabOrigin.origin;
+    }
+    if (stage) {
+        return (stage.center().y - this.bottom()) / stage.scale;
+    }
+    return this.bottom();
+};
+
 // SpriteMorph message broadcasting
 
 SpriteMorph.prototype.allMessageNames = function () {
diff --git a/src/threads.js b/src/threads.js
index 48cf4bc0..d9763051 100644
--- a/src/threads.js
+++ b/src/threads.js
@@ -61,7 +61,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, Color,
 TableFrameMorph, ColorSlotMorph, isSnapObject, Map, newCanvas, Symbol*/
 
-modules.threads = '2019-October-16';
+modules.threads = '2019-October-17';
 
 var ThreadManager;
 var Process;
@@ -4347,6 +4347,14 @@ Process.prototype.reportGet = function (query) {
             return thisObj.xCenter();
         case 'center y':
             return thisObj.yCenter();
+        case 'left':
+            return thisObj.xLeft();
+        case 'right':
+            return thisObj.xRight();
+        case 'top':
+            return thisObj.yTop();
+        case 'bottom':
+            return thisObj.yBottom();
         case 'name':
             return thisObj.name;
         case 'stage':