diff --git a/desktop/sources/scripts/lisp.js b/desktop/sources/scripts/lisp.js
index b1907ca..07d2c91 100644
--- a/desktop/sources/scripts/lisp.js
+++ b/desktop/sources/scripts/lisp.js
@@ -113,7 +113,6 @@ function Lisp (lib = {}, includes = []) {
 
   const interpret = async function (input, context) {
     if (!input) { console.warn('Lisp', 'error', context.scope); return null }
-
     if (context === undefined) {
       return interpret(input, new Context(lib))
     } else if (input instanceof Array) {
diff --git a/desktop/sources/scripts/ronin.js b/desktop/sources/scripts/ronin.js
index ee7236c..db384a9 100644
--- a/desktop/sources/scripts/ronin.js
+++ b/desktop/sources/scripts/ronin.js
@@ -126,13 +126,13 @@ function Ronin () {
       a: { x: this.mouseOrigin.x, y: this.mouseOrigin.y },
       b: { x: pos.x, y: pos.y }
     }
-    const distance = Math.sqrt(((line.a.x - line.b.x) * (line.a.x - line.b.x)) + ((line.a.y - line.b.y) * (line.a.y - line.b.y)))
+    const d = Math.sqrt(((line.a.x - line.b.x) * (line.a.x - line.b.x)) + ((line.a.y - line.b.y) * (line.a.y - line.b.y)))
     const circle = {
       cx: this.mouseOrigin.x,
       cy: this.mouseOrigin.y,
-      r: distance
+      r: d
     }
-    return { x, y, line, rect, pos, circle, type, 'is-down': type !== 'mouse-up' ? true : null }
+    return { x, y, d, line, rect, pos, circle, type, 'is-down': type !== 'mouse-up' ? true : null }
   }
 
   // Zoom
diff --git a/examples/projects/spire.lisp b/examples/projects/spire.lisp
new file mode 100644
index 0000000..4bea501
--- /dev/null
+++ b/examples/projects/spire.lisp
@@ -0,0 +1,16 @@
+; this demo shows how to use the mouse events to draw make a simple drawing tool.
+;
+(clear)
+;
+(def gradient-line 
+  (line frame-rect:c 0 frame-rect:c frame-rect:h))
+;
+(defn draw-circle 
+  (e) 
+  (
+    (stroke 
+      (circle e:x e:y e:d) 1 
+      (gradient gradient-line 
+        ("black" "#ffb545")))))
+;
+(on "mouse-move" draw-circle)
\ No newline at end of file
diff --git a/examples/projects/tunnel.lisp b/examples/projects/tunnel.lisp
deleted file mode 100644
index 7316877..0000000
--- a/examples/projects/tunnel.lisp
+++ /dev/null
@@ -1,37 +0,0 @@
-; this demo shows how to use the mouse events to draw make a simple drawing tool.
-;
-(clear)
-;
-(def prev-pos {:x 0 :y 0})
-;
-(defn stroke-color 
-  (e) 
-  (if 
-    (eq e:is-down true) "#ffb545" "#72dec2")) 
-;
-(defn draw-line 
-  (e) 
-  (
-    (if 
-      (eq e:is-down true) 
-      (
-        (debug e:is-down) 
-        (stroke 
-          (line prev-pos:x prev-pos:y e:x e:y) 2 "white") 
-        (set prev-pos "x" e:x "y" e:y) 
-        (debug prev-pos) 
-        (debug e)))))
-;
-(defn draw-circle 
-  (e) 
-  (
-    (debug e) 
-    (set prev-pos "x" e:x "y" e:y) 
-    (debug e:x) 
-    (stroke 
-      (circle e:x e:y 10) 4 
-      (stroke-color e))))
-;
-(on "mouse-down" draw-circle)
-(on "mouse-up" draw-circle)
-(on "mouse-move" draw-line)
\ No newline at end of file