diff --git a/data/scenarios/Fun/_spider/monkey.sw b/data/scenarios/Fun/_spider/monkey.sw
new file mode 100644
index 000000000..81667888a
--- /dev/null
+++ b/data/scenarios/Fun/_spider/monkey.sw
@@ -0,0 +1,55 @@
+def doN = \n. \f. if (n > 0) {f; doN (n - 1) f} {}; end;
+
+def intersperse = \n. \f2. \f1. if (n > 0) {
+        f1;
+        if (n > 1) {
+            f2;
+        } {};
+        intersperse (n - 1) f2 f1;
+    } {};
+    end;
+
+def placeBoulder =  \border.
+    create border;
+
+    isEmptyHere <- isempty;
+    if isEmptyHere {
+        place border
+    } {
+        swap border;
+        return ();
+    };
+    
+    return ();
+end
+
+def spinWeb = \border.
+    move;
+    turn left;
+
+    try {
+        intersperse 2 move $ placeBoulder border;
+        doN 3 (
+            turn left;
+            doN 2 (placeBoulder border; move);
+        );
+        placeBoulder border;
+    } {};
+end
+
+def goDir = \f. \result.
+    let d = fst result in
+    if (d == down) {
+        spinWeb "mountain";
+    } {
+        turn d; move;
+    };
+    f;
+end;
+
+def followRoute = \item.
+    nextDir <- path (inL ()) (inR item);
+    case nextDir return $ goDir $ followRoute item;
+    end;
+
+followRoute "tree";
\ No newline at end of file
diff --git a/data/scenarios/Fun/_spider/spider.sw b/data/scenarios/Fun/_spider/spider.sw
new file mode 100644
index 000000000..5a3c144ea
--- /dev/null
+++ b/data/scenarios/Fun/_spider/spider.sw
@@ -0,0 +1,55 @@
+def doN = \n. \f. if (n > 0) {f; doN (n - 1) f} {}; end;
+
+def intersperse = \n. \f2. \f1. if (n > 0) {
+        f1;
+        if (n > 1) {
+            f2;
+        } {};
+        intersperse (n - 1) f2 f1;
+    } {};
+    end;
+
+def placeBoulder =  \border.
+    create border;
+
+    isEmptyHere <- isempty;
+    if isEmptyHere {
+        place border
+    } {
+        swap border;
+        return ();
+    };
+    
+    return ();
+end
+
+def spinWeb = \border.
+    move;
+    turn left;
+
+    try {
+        intersperse 2 move $ placeBoulder border;
+        doN 3 (
+            turn left;
+            doN 2 (placeBoulder border; move);
+        );
+        placeBoulder border;
+    } {};
+end
+
+def goDir = \f. \result.
+    let d = fst result in
+    if (d == down) {
+        spinWeb "mountain";
+    } {
+        turn d; move;
+    };
+    f;
+end;
+
+def followRoute = \item.
+    nextDir <- path (inL ()) (inR item);
+    case nextDir return $ goDir $ followRoute item;
+    end;
+
+followRoute "flower";
\ No newline at end of file
diff --git a/data/scenarios/Fun/spider.yaml b/data/scenarios/Fun/spider.yaml
new file mode 100644
index 000000000..505440fb4
--- /dev/null
+++ b/data/scenarios/Fun/spider.yaml
@@ -0,0 +1,46 @@
+version: 1
+name: Spiders
+description: |
+  Spiders catching prey by spinning webs
+creative: true
+robots:
+  - name: base
+    dir: north
+    loc: [5, 0]
+  - name: spider
+    display:
+      invisible: false
+      attr: blue
+    dir: north
+    system: true
+    loc: [0, 0]
+    program: |
+      run "scenarios/Fun/_spider/spider.sw"
+  - name: monkey
+    display:
+      invisible: false
+      attr: red
+    dir: north
+    system: true
+    loc: [0, 0]
+    program: |
+      run "scenarios/Fun/_spider/monkey.sw"
+structures:
+  - name: cocoon
+    recognize: [north]
+    structure:
+      mask: '.'
+      palette:
+        'b': [grass, mountain]
+      map: |
+        bbb
+        b.b
+        bbb
+known: [tree]
+world:
+  dsl: |
+    overlay
+      [ {grass}
+      , mask ((hash % 200) == 0) {flower}
+      , mask (((hash+1) % 200) == 0) {tree}
+      ]
\ No newline at end of file
diff --git a/scripts/gen/preview-world-vscode.sh b/scripts/gen/preview-world-vscode.sh
index bf91977ea..4f1ba3b87 100755
--- a/scripts/gen/preview-world-vscode.sh
+++ b/scripts/gen/preview-world-vscode.sh
@@ -25,9 +25,9 @@ IMG_WIDTH=200
 IMG_HEIGHT=150
 
 IMG_OUTPUT_PATH=output.png
-RENDER_IMG_COMMAND="stack exec swarm-scene -- $SCENARIO_PATH --fail-blank --dest $IMG_OUTPUT_PATH --png --width $IMG_WIDTH --height $IMG_HEIGHT"
+RENDER_IMG_COMMAND="cabal run swarm-scene -- $SCENARIO_PATH --fail-blank --dest $IMG_OUTPUT_PATH --png --width $IMG_WIDTH --height $IMG_HEIGHT"
 
-stack build --fast swarm:swarm-scene
+cabal build -j -O0 swarm:swarm-scene
 
 $RENDER_IMG_COMMAND
 code --reuse-window $SCENARIO_PATH && code --reuse-window $IMG_OUTPUT_PATH