diff -r 8979a6638424 -r 17d71ca4ce84 src/cube.rs
--- a/src/cube.rs	Mon Oct 21 10:02:57 2024 -0500
+++ b/src/cube.rs	Mon Oct 21 10:05:07 2024 -0500
@@ -241,7 +241,7 @@
 impl ManifoldPoint for OnCube {
     type Tangent = Point;
 
-    fn exp(&self, tangent : &Self::Tangent) -> Self {
+    fn exp(self, tangent : &Self::Tangent) -> Self {
         let mut face = self.face;
         let mut point = self.point + tangent;
         loop {