diff --git a/engine/src/lib.rs b/engine/src/lib.rs
index 79c8235..2607feb 100644
--- a/engine/src/lib.rs
+++ b/engine/src/lib.rs
@@ -4,7 +4,12 @@ pub use bevy::{
     asset::{AssetPath, HandleTemplate},
     audio::{AudioPlayerTemplate, Volume},
     color::palettes::basic::*,
-    feathers::{FeathersPlugins, controls::*},
+    feathers::{
+        FeathersPlugins,
+        controls::*,
+        dark_theme::create_dark_theme,
+        theme::{ThemedText, UiTheme},
+    },
     input::{
         common_conditions::*,
         mouse::{AccumulatedMouseMotion, MouseMotion},
diff --git a/life/src/main.rs b/life/src/main.rs
index ee08f94..85085d8 100644
--- a/life/src/main.rs
+++ b/life/src/main.rs
@@ -1,13 +1,8 @@
-use bevy::{
-    asset::{AssetPath, HandleTemplate},
-    audio::AudioPlayerTemplate,
-    mesh::Mesh2dTemplate,
-    sprite_render::MeshMaterial2dTemplate,
-};
+use bevy::{feathers::theme::ThemeProps, ui::InteractionDisabled};
 use engine::*;
 
 const TILE: &str = "tileGrey_01.png";
-const FRAME_DURATION: f32 = 0.5;
+const SIM_FRAME_DURATION: f32 = 0.5;
 
 fn main() {
     App::new()
@@ -20,6 +15,7 @@ fn main() {
         .init_resource::<CellAssets>()
         .init_resource::<Panning>()
         .insert_resource(ClearColor(WHITE.into()))
+        .insert_resource(UiTheme(create_light_theme()))
         .init_state::<SimulationPlayback>()
         .init_state::<AudioPlayback>()
         .add_message::<Lifecycle>()
@@ -58,27 +54,19 @@ fn main() {
             Update,
             simulation_step
                 .run_if(in_state(SimulationPlayback::Run))
-                .run_if(cooldown_secs(FRAME_DURATION)),
+                .run_if(cooldown_secs(SIM_FRAME_DURATION)),
         )
         .add_systems(
             Update,
             simulation_step.run_if(state_changed::<SimulationPlayback>),
         )
-        .add_systems(
-            Update,
-            visualize_ui_state.run_if(on_message::<Pointer<Click>>),
-        )
+        // TODO: Visualize audio play/mute buttons enable/disable
+        .add_systems(Update, toggle_interactive::<SimulationPlayback>)
+        .add_systems(Update, toggle_interactive::<AudioPlayback>)
+        // TODO Visualize simulation run/pause buttons enable/disable
         .add_systems(Update, cell_lifecycle.run_if(on_message::<Lifecycle>))
         .add_systems(Update, mouse_pan.run_if(on_message::<MouseMotion>))
         .add_systems(Update, set_pan_state)
-        .add_systems(
-            Update,
-            toggle_state_entities::<SimulationPlayback>.run_if(state_changed::<SimulationPlayback>),
-        )
-        .add_systems(
-            Update,
-            toggle_state_entities::<AudioPlayback>.run_if(state_changed::<AudioPlayback>),
-        )
         .run();
 }
 
@@ -176,13 +164,13 @@ fn the_ui() -> impl Scene {
                     writer.write(AppExit::Success);
                 }),
             ui_button(UiButton::Pause)
-                SimulationPlayback::Run
+                SimulationPlayback::Pause
                 on(|_: On<Activate>, mut next: ResMut<NextState<SimulationPlayback>>| {
                     // Set simulation state
                     next.set(SimulationPlayback::Pause);
                 }),
             ui_button(UiButton::Play)
-                SimulationPlayback::Pause
+                SimulationPlayback::Run
                 on(|_: On<Activate>, mut next: ResMut<NextState<SimulationPlayback>>| {
                     // Set simulation state
                     next.set(SimulationPlayback::Run);
@@ -210,12 +198,12 @@ fn the_ui() -> impl Scene {
                     });
                 }),
             ui_button(UiButton::MuteAudio)
-                AudioPlayback::Play
+                AudioPlayback::Mute
                 on(|_: On<Activate>, mut next: ResMut<NextState<AudioPlayback>>| {
                     next.set(AudioPlayback::Mute);
                 }),
             ui_button(UiButton::PlayAudio)
-                AudioPlayback::Mute
+                AudioPlayback::Play
                 on(|_: On<Activate>, mut next: ResMut<NextState<AudioPlayback>>| {
                     next.set(AudioPlayback::Play);
                 }),
@@ -506,7 +494,8 @@ fn new_cell(
     let c = Coordinates { x, y };
 
     let volume = {
-        if *sim_state.get() == SimulationPlayback::Run && *audio_state.get() == AudioPlayback::Play {
+        if *sim_state.get() == SimulationPlayback::Run && *audio_state.get() == AudioPlayback::Play
+        {
             let ratio = 1.0 / (sinks.count() + 1) as f32;
             Volume::Linear(ratio)
         } else {
@@ -565,23 +554,6 @@ fn cooldown_secs(input: f32) -> impl FnMut(Local<Timer>, Res<Time>) -> bool + Cl
     }
 }
 
-// Visualize active state (run vs pause):
-//   If in Run state, keep Run button light, or blinking or outlined or something.
-//   If in Pause state, keep Pauses button light, or blinking or outlined or something.
-fn visualize_ui_state(
-    mut query: Query<(&UiButton, &mut Outline)>,
-    state: Res<State<SimulationPlayback>>,
-) {
-    query.iter_mut().for_each(|(uib, mut o)| {
-        o.color = match (uib, state.get()) {
-            (UiButton::Pause, SimulationPlayback::Pause) => BLACK.into(),
-            (UiButton::Step, SimulationPlayback::Step) => BLACK.into(),
-            (UiButton::Play, SimulationPlayback::Run) => BLACK.into(),
-            _ => Color::NONE,
-        }
-    });
-}
-
 // Scale grid with background?
 // Pan camera: click and drag
 
@@ -769,17 +741,41 @@ fn is_panning(panning: Res<Panning>) -> bool {
     panning.0
 }
 
-fn toggle_state_entities<S: States + Component>(
-    mut query: Query<(&mut Visibility, &S)>,
-    state: Res<State<S>>,
+// TODO: Do not spawn cell when clicking UI
+
+// This may or may not be an eye sore
+fn create_light_theme() -> ThemeProps {
+    ThemeProps {
+        color: create_dark_theme()
+            .color
+            .iter()
+            .map(|(token, color)| {
+                let c = match color {
+                    Color::Oklcha(oklcha) => Color::Oklcha(Oklcha {
+                        lightness: oklcha.lightness + 0.1,
+                        ..*oklcha
+                    }),
+                    x => {
+                        info!("Passing along color theme {:?} {:?}", token, x);
+                        *x
+                    }
+                };
+                (token.clone(), c)
+            })
+            .collect(),
+    }
+}
+
+fn toggle_interactive<T: Component + States + PartialEq>(
+    q: Query<(Entity, &T)>,
+    s: Res<State<T>>,
+    mut commands: Commands,
 ) {
-    query.iter_mut().for_each(|(mut v, s)| {
-        *v = if state.get() == s {
-            Visibility::Inherited
+    q.iter().for_each(|(e, c)| {
+        if c == s.get() {
+            commands.entity(e).insert(InteractionDisabled);
         } else {
-            Visibility::Hidden
-        };
-    });
+            commands.entity(e).remove::<InteractionDisabled>();
+        }
+    })
 }
-
-// TODO: Do not spawn cell when clicking UI