diff --git a/src/main.rs b/src/main.rs
index f327394..22b4433 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -57,6 +57,7 @@ fn dummy_machines(mut commands: Commands) {
 
   commands
     .spawn((
+      RotatingMachine,
       Sprite::from_color(GREEN, Vec2::splat(40.0)),
       Transform::from_translation(Vec3::new(40.0, 40.0, 0.0)),
       Pickable::default(),
@@ -66,6 +67,7 @@ fn dummy_machines(mut commands: Commands) {
   // TODO: The other observers, once they have a spawner struct & impl.
   commands
     .spawn((
+      FlippingMachine,
       Sprite::from_color(PURPLE, Vec2::splat(40.)),
       Transform::from_translation(Vec3::new(-40.0, -40.0, 0.0)),
       Pickable::default(),
@@ -74,6 +76,7 @@ fn dummy_machines(mut commands: Commands) {
 
   commands
     .spawn((
+      TransposingMachine,
       Sprite::from_color(DARK_ORANGE, Vec2::splat(40.)),
       Transform::from_translation(Vec3::new(40.0, -40.0, 0.0)),
       Pickable::default(),