diff --git a/prototypes/src/bin/life.rs b/prototypes/src/bin/life.rs
index e7bf273..f23e7fc 100644
--- a/prototypes/src/bin/life.rs
+++ b/prototypes/src/bin/life.rs
@@ -275,15 +275,21 @@ impl Coordinates {
 
 
     fn as_cell_pitch(&self) -> CellPitch {
-        let note = match (self.x % 5) - 2 {
-            -2 => Note::A,
-            -1 => Note::B,
-            0 => Note::CSharp,
-            1 => Note::E,
-            2 => Note::FSharp,
+        debug!("Generating cell pitch for {:?}", self);
+
+        let note = match (self.x + 2).abs() % 5 {
+            0 => Note::A,
+            1 => Note::B,
+            2 => Note::CSharp,
+            3 => Note::E,
+            4 => Note::FSharp,
             _ => panic!("This shouldn't happen!"),
         };
-        let octave = (self.y % 5) - 2;
+
+        let octave = ((self.y + 2).abs() % 5) - 2;
+        debug_assert!((-2..=2).contains(&octave));
+
+        debug!("\t{:?}", CellPitch { note: note.clone(), octave });
 
         CellPitch {
             note, octave
@@ -302,7 +308,8 @@ fn on_add_coordinates(
 
     // based on coordinates, get material, mesh, and tone from cell_assets
     if cells.contains(trigger.entity) {
-        let mat_h = cell_assets.materials.get(c).unwrap();
+        let pitch = c.as_cell_pitch();
+        let mat_h = cell_assets.materials.get(&pitch).unwrap();
         let mesh_mat_2d = MeshMaterial2d(mat_h.clone());
         commands.entity(trigger.entity).insert(mesh_mat_2d);
 
@@ -317,7 +324,6 @@ fn on_add_coordinates(
     };
     commands.entity(trigger.entity).insert(t);
 
-    // FIXME!!!
     let p = cell_assets.pitches.get(&c.as_cell_pitch()).unwrap();
     commands.entity(trigger.entity).insert((AudioPlayer(p.clone()), PlaybackSettings::LOOP));
 }
@@ -532,7 +538,7 @@ fn visualize_ui_state(
 #[derive(Resource, Default)]
 struct CellAssets {
     pitches: HashMap<CellPitch, Handle<Pitch>>,
-    materials: HashMap<Coordinates, Handle<ColorMaterial>>,
+    materials: HashMap<CellPitch, Handle<ColorMaterial>>,
     mesh: Handle<Mesh>,
 }
 
@@ -601,6 +607,7 @@ fn load_audio_tones(mut pitches: ResMut<Assets<Pitch>>, mut cell_assets: ResMut<
             cell_assets.pitches.insert(cell_pitch, handle);
         });
     });
+    debug_assert!(cell_assets.pitches.iter().len() == 25);
 }
 
 fn load_materials(
@@ -610,22 +617,22 @@ fn load_materials(
 ) {
     let vertical = [-2, -1, 0, 1, 2];
     let horizontal = [-2, -1, 0, 1, 2];
-    let texture = server.load(TILE);
+    let tile_handle = server.load(TILE);
 
     vertical.iter().for_each(|&x| {
         horizontal.iter().for_each(|&y| {
             let c = Coordinates { x, y };
-            let color = c.as_color();
-            cell_assets.materials.insert(
-                c,
-                materials.add(ColorMaterial {
-                    texture: Some(texture.clone()),
-                    color,
-                    ..default()
-                }),
-            );
+            let pitch =  c.as_cell_pitch();
+            let handle = {
+                let color = c.as_color();
+                let texture = Some(tile_handle.clone());
+                let color_material = ColorMaterial { color, texture, ..default() };
+                materials.add(color_material)
+            };
+            cell_assets.materials.insert(pitch, handle);
         });
     });
+    debug_assert!(cell_assets.materials.iter().len() == 25);
 }
 
 fn load_meshes(mut cell_assets: ResMut<CellAssets>, mut meshes: ResMut<Assets<Mesh>>) {