diff --git a/Platforms/Android/AndroidManifest.xml b/Platforms/Android/AndroidManifest.xml
index 8136c10..6dc3efa 100644
--- a/Platforms/Android/AndroidManifest.xml
+++ b/Platforms/Android/AndroidManifest.xml
@@ -1,9 +1,9 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8" ?>
 <manifest
   xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.dofdev.snake"
-  android:versionCode="48"
-  android:versionName="1.53"
+  android:versionCode="50"
+  android:versionName="1.55"
   android:installLocation="auto"
 >
   <uses-sdk android:minSdkVersion="29" android:targetSdkVersion="32" />
@@ -17,25 +17,43 @@
   <!-- <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" /> -->
 
   <!-- Generic OpenXR items -->
-  <uses-feature    android:name="android.hardware.vr.headtracking" android:required="true" android:version="1" />
+  <uses-feature
+    android:name="android.hardware.vr.headtracking"
+    android:required="true"
+    android:version="1"
+  />
   <uses-permission android:name="org.khronos.openxr.permission.OPENXR_SYSTEM" />
   <uses-permission android:name="org.khronos.openxr.permission.OPENXR" />
   <queries>
-    <provider android:authorities="org.khronos.openxr.runtime_broker;org.khronos.openxr.system_runtime_broker" />
-    <intent> <action android:name="org.khronos.openxr.OpenXRRuntimeService" /> </intent>
-    <intent> <action android:name="org.khronos.openxr.OpenXRApiLayerService" /> </intent>
+    <provider
+      android:authorities="org.khronos.openxr.runtime_broker;org.khronos.openxr.system_runtime_broker"
+    />
+    <intent> <action
+        android:name="org.khronos.openxr.OpenXRRuntimeService"
+      /> </intent>
+    <intent> <action
+        android:name="org.khronos.openxr.OpenXRApiLayerService"
+      /> </intent>
   </queries>
 
   <!-- Vive specific items  -->
-  <uses-feature android:name="wave.feature.handtracking" android:required="false" />
-  <uses-feature android:name="wave.feature.tracker"      android:required="false" />
+  <uses-feature
+    android:name="wave.feature.handtracking"
+    android:required="false"
+  />
+  <uses-feature android:name="wave.feature.tracker" android:required="false" />
 
   <!-- Snapdragon specific items -->
-  <uses-permission android:name="com.qualcomm.qti.qxr.QXRServiceClientPermission" android:required="false" />
+  <uses-permission
+    android:name="com.qualcomm.qti.qxr.QXRServiceClientPermission"
+    android:required="false"
+  />
   <queries>
     <package android:name="com.qualcomm.qti.spaces.services" />
     <package android:name="com.qualcomm.qti.openxrruntime" />
-    <intent> <action android:name="com.qualcomm.qti.openxr.spaces.intent.action.BIND" /> </intent>
+    <intent> <action
+        android:name="com.qualcomm.qti.openxr.spaces.intent.action.BIND"
+      /> </intent>
   </queries>
 
   <!-- Oculus specific items -->
@@ -45,11 +63,26 @@
   <uses-permission android:name="com.oculus.permission.EYE_TRACKING" />
   <uses-permission android:name="com.oculus.permission.USE_ANCHOR_API" />
   <uses-permission android:name="com.oculus.permission.USE_SCENE" />
-  <uses-feature    android:name="com.oculus.feature.PASSTHROUGH"      android:required="true" />
-  <uses-feature    android:name="oculus.software.handtracking"        android:required="false" />
-  <uses-feature    android:name="com.oculus.software.body_tracking"   android:required="false" />
-  <uses-feature    android:name="oculus.software.face_tracking"       android:required="false" />
-  <uses-feature    android:name="oculus.software.eye_tracking"        android:required="false" />
+  <uses-feature
+    android:name="com.oculus.feature.PASSTHROUGH"
+    android:required="true"
+  />
+  <uses-feature
+    android:name="oculus.software.handtracking"
+    android:required="false"
+  />
+  <uses-feature
+    android:name="com.oculus.software.body_tracking"
+    android:required="false"
+  />
+  <uses-feature
+    android:name="oculus.software.face_tracking"
+    android:required="false"
+  />
+  <uses-feature
+    android:name="oculus.software.eye_tracking"
+    android:required="false"
+  />
 
   <application
     android:allowBackup="false"
@@ -59,11 +92,23 @@
     android:supportsRtl="true"
   >
     <!-- Oculus -->
-    <meta-data android:name="com.oculus.supportedDevices" android:value="quest2|quest3|questpro" />
-    <meta-data android:name="com.oculus.handtracking.version" android:value="V2.0" />
-    <meta-data android:name="com.oculus.ossplash.background" android:value="passthrough-contextual" />
+    <meta-data
+      android:name="com.oculus.supportedDevices"
+      android:value="quest2|quest3|questpro"
+    />
+    <meta-data
+      android:name="com.oculus.handtracking.version"
+      android:value="V2.0"
+    />
+    <meta-data
+      android:name="com.oculus.ossplash.background"
+      android:value="passthrough-contextual"
+    />
     <meta-data android:name="com.oculus.vr.focusaware" android:value="true" />
-    <uses-native-library android:name="libopenxr_forwardloader.oculus.so" android:required="false" />
+    <uses-native-library
+      android:name="libopenxr_forwardloader.oculus.so"
+      android:required="false"
+    />
     <!-- Pico -->
     <meta-data android:name="pvr.app.type" android:value="vr" />
     <meta-data android:name="handtracking" android:value="1" />
@@ -86,4 +131,4 @@
       </intent-filter>
     </activity>
   </application>
-</manifest>
\ No newline at end of file
+</manifest>
diff --git a/readme.md b/readme.md
index baebdce..e788456 100644
--- a/readme.md
+++ b/readme.md
@@ -54,12 +54,12 @@ todo
 
   benchmark
     need to be able to play without moving/turning the box
+    DepthTest Material.DepthTest { get; set; }
+      you could use DepthTest.Greater to draw a glow that indicates an object is behind something.
 
   start music on egg eat
     to keep prior tutorial phase focused and a strong indication that auto move has kicked in
 
-  curved hanger
-
   my tempo (zen mode *after initial release*)
     on l_con tap (a) btn to step, and repeatedly to set tempo
     once a tempo has been set you can stop tapping and you'll coast at that tempo
diff --git a/src/Arts.cs b/src/Arts.cs
index 5d9a762..e275033 100644
--- a/src/Arts.cs
+++ b/src/Arts.cs
@@ -84,22 +84,66 @@ static class Arts
             box_scale
         );
 
-        // hanger
+        // telescoping hanging rod
         if (Mono.in_cone.state && Mono.box_mode == Mono.BoxMode.Hold || Mono.box_mode == Mono.BoxMode.Mount)
         {
             float box_head_dist = Vec3.Distance(box_pos, Rig.head.position);
-            Lines.Add(
-                box_m4 * V.XYZ(0, Mono.SD_Y - 0.5f, 0),
-                Rig.head.position + Rig.head.orientation * V.XYZ(0, 6 * U.cm, -box_head_dist),
-                Color.Hex(0x808080FF).ToLinear(),
-                1.0f * U.mm
-            );
-            Lines.Add(
-                Rig.head.position + Rig.head.orientation * V.XYZ(0, 6 * U.cm, -box_head_dist),
-                Rig.head.position + Rig.head.orientation * V.XYZ(0, 6 * U.cm, 0),
-                Color.Hex(0x808080FF).ToLinear(),
-                1.0f * U.mm
+
+            Vec3 box_mount = box_m4 * V.XYZ(0, Mono.SD_Y - 0.5f, 0);
+            Vec3 box_handl = Rig.head.position + Rig.head.orientation * V.XYZ(0, 6 * U.cm, -box_head_dist);
+
+            Vec3 head_mount = Rig.head.position + Rig.head.orientation * V.XYZ(0, 6 * U.cm, 0);
+            Vec3 head_handl = Vec3.Lerp(box_handl, head_mount, 0.5f);
+            Vec3[] p = new Vec3[] {
+                box_mount,
+                box_handl,
+
+                head_handl,
+                head_mount,
+            };
+
+            // debug bezier points
+            // for (int i = 0; i < p.Length; i++)
+            // {
+            //     Mesh.Sphere.Draw(
+            //         mat_justcolor,
+            //         Matrix.TS(
+            //             p[i],
+            //             2 * U.mm
+            //         ),
+            //         Color.White
+            //     );
+            // }
+
+            Mesh.Sphere.Draw(
+                mat_justcolor,
+                Matrix.TS(
+                    box_mount,
+                    3 * U.mm
+                ),
+                Color.Hex(0x959493FF).ToLinear()
             );
+
+            int steps = 64;
+            Vec3 pastPos = p[0];
+            float pastThc = 0.0f;
+            for (int i = 0; i < steps; i++)
+            {
+                float t = (float)i / (steps - 1);
+                Vec3 a = Vec3.Lerp(p[0], p[1], t);
+                Vec3 b = Vec3.Lerp(p[1], p[2], t);
+                Vec3 c = Vec3.Lerp(p[2], p[3], t);
+                Vec3 pos = Vec3.Lerp(Vec3.Lerp(a, b, t), Vec3.Lerp(b, c, t), t);
+                float thc = (1.0f + Maths.precision(t, 0.2f) * 2.0f) * U.mm;
+                Lines.Add(
+                    pastPos,
+                    pos,
+                    thc != pastThc ? Color.Hex(0x959493FF).ToLinear() : Color.Hex(0x808080FF).ToLinear(),
+                    thc
+                );
+                pastPos = pos;
+                pastThc = thc;
+            }
         }
 
         // box contents
diff --git a/src/Maths.cs b/src/Maths.cs
index ba23f40..cf96010 100644
--- a/src/Maths.cs
+++ b/src/Maths.cs
@@ -35,7 +35,10 @@ public static class Maths
     // public static int roundi(float value) => MathF.Round(value)
 
     public static float precision(float x, float p)
-        => round(x * p) / p;
+    {
+        float ps = p < 1.0f ? 1 / p : p;
+        return round(x * ps) / ps;
+    }
 
     public static float smooth_start(float t) => (t * t * t);
     public static float smooth_stop(float t)
@@ -43,6 +46,11 @@ public static class Maths
         float s = sign(t);
         return (s - ((s - t) * (s - t) * (s - t)));
     }
+    public static float less_smooth_stop(float t) // [!] messy implementation
+    {
+        float s = sign(t);
+        return (s - ((s - t) * (s - t)));
+    }
 
     public static float lerp(float a, float b, float t) => a + (b - a) * t;
 }