diff --git a/masque/pattern.py b/masque/pattern.py
index f4fb649..6b2de99 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -793,18 +793,22 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
             cast('Rotatable', entry).rotate(rotation)
         return self
 
-    def mirror_elements(self, across_axis: int = 0) -> Self:
+    def mirror_elements(self, axis: int = 0) -> Self:
         """
-        Mirror each shape, ref, and port relative to (0,0).
+        Mirror each shape, ref, and port relative to its offset.
 
         Args:
-            across_axis: Axis to mirror across
-                (0: mirror across x axis, 1: mirror across y axis)
+            axis: Axis to mirror across
+                0: mirror across x axis (flip y),
+                1: mirror across y axis (flip x)
 
         Returns:
             self
         """
-        return self.flip_across(axis=across_axis)
+        for entry in chain(chain_elements(self.shapes, self.refs), self.ports.values()):
+            cast('Mirrorable', entry).mirror(axis=axis)
+        self._log_bulk_update(f"mirror_elements({axis})")
+        return self
 
     def mirror(self, axis: int = 0) -> Self:
         """