diff --git a/app-proto/src/assembly.rs b/app-proto/src/assembly.rs
index 8e4b96f..4da9422 100644
--- a/app-proto/src/assembly.rs
+++ b/app-proto/src/assembly.rs
@@ -127,7 +127,7 @@ pub trait Element: Serial + ProblemPoser + DisplayItem {
 }
 
 impl Debug for dyn Element {
-    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         self.id().fmt(f)
     }
 }
@@ -511,10 +511,18 @@ impl ProblemPoser for HalfCurvatureRegulator {
 }
 
 #[derive(Clone, Copy, Sequence)]
-pub enum Axis {X = 0, Y = 1, Z = 2}
+pub enum Axis { X = 0, Y = 1, Z = 2 }
 
 impl Axis {
-    pub const NAME: [&str; Axis::CARDINALITY] = ["X", "Y", "Z"];
+    fn name(&self) -> &'static str {
+        match self { Axis::X => "X", Axis::Y => "Y", Axis::Z => "Z" }
+    }
+}
+
+impl fmt::Display for Axis {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(self.name())
+    }
 }
 
 pub struct PointCoordinateRegulator {
diff --git a/app-proto/src/components/outline.rs b/app-proto/src/components/outline.rs
index d9ab71d..547b73b 100644
--- a/app-proto/src/components/outline.rs
+++ b/app-proto/src/components/outline.rs
@@ -6,7 +6,6 @@ use web_sys::{KeyboardEvent, MouseEvent, wasm_bindgen::JsCast};
 use crate::{
     AppState,
     assembly::{
-        Axis,
         Element,
         HalfCurvatureRegulator,
         InversiveDistanceRegulator,
@@ -123,7 +122,7 @@ impl OutlineItem for HalfCurvatureRegulator {
 
 impl OutlineItem for PointCoordinateRegulator {
     fn outline_item(self: Rc<Self>, _element: &Rc<dyn Element>) -> View {
-        let name = format!("{} coordinate", Axis::NAME[self.axis as usize]);
+        let name = format!("{} coordinate", self.axis);
         view! {
             li(class = "regulator") {
                 div(class = "regulator-label") // for spacing