diff --git a/masque/abstract.py b/masque/abstract.py
index 7135eba..1266ae6 100644
--- a/masque/abstract.py
+++ b/masque/abstract.py
@@ -8,16 +8,13 @@ from numpy.typing import ArrayLike
 from .ref import Ref
 from .ports import PortList, Port
 from .utils import rotation_matrix_2d
-
-#if TYPE_CHECKING:
-#    from .builder import Builder, Tool
-#    from .library import ILibrary
+from .traits import Flippable
 
 
 logger = logging.getLogger(__name__)
 
 
-class Abstract(PortList):
+class Abstract(PortList, Flippable):
     """
     An `Abstract` is a container for a name and associated ports.
 
@@ -131,50 +128,18 @@ class Abstract(PortList):
             port.rotate(rotation)
         return self
 
-    def mirror_port_offsets(self, across_axis: int = 0) -> Self:
+    def mirror(self, axis: int = 0) -> Self:
         """
-        Mirror the offsets of all shapes, labels, and refs across an axis
+        Mirror the Abstract across an axis through its origin.
 
         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, 1: mirror across y axis)
 
         Returns:
             self
         """
         for port in self.ports.values():
-            port.offset[across_axis - 1] *= -1
-        return self
-
-    def mirror_ports(self, across_axis: int = 0) -> Self:
-        """
-        Mirror each port's rotation across an axis, relative to its
-          offset
-
-        Args:
-            across_axis: Axis to mirror across
-                (0: mirror across x axis, 1: mirror across y axis)
-
-        Returns:
-            self
-        """
-        for port in self.ports.values():
-            port.mirror(across_axis)
-        return self
-
-    def mirror(self, across_axis: int = 0) -> Self:
-        """
-        Mirror the Pattern across an axis
-
-        Args:
-            axis: Axis to mirror across
-                (0: mirror across x axis, 1: mirror across y axis)
-
-        Returns:
-            self
-        """
-        self.mirror_ports(across_axis)
-        self.mirror_port_offsets(across_axis)
+            port.flip_across(axis=axis)
         return self
 
     def apply_ref_transform(self, ref: Ref) -> Self:
diff --git a/masque/label.py b/masque/label.py
index 89f0384..3f4f80e 100644
--- a/masque/label.py
+++ b/masque/label.py
@@ -7,12 +7,12 @@ from numpy.typing import ArrayLike, NDArray
 
 from .repetition import Repetition
 from .utils import rotation_matrix_2d, annotations_t, annotations_eq, annotations_lt, rep2key
-from .traits import PositionableImpl, Copyable, Pivotable, RepeatableImpl, Bounded
+from .traits import PositionableImpl, Copyable, Pivotable, RepeatableImpl, Bounded, Flippable
 from .traits import AnnotatableImpl
 
 
 @functools.total_ordering
-class Label(PositionableImpl, RepeatableImpl, AnnotatableImpl, Bounded, Pivotable, Copyable):
+class Label(PositionableImpl, RepeatableImpl, AnnotatableImpl, Bounded, Pivotable, Copyable, Flippable):
     """
     A text annotation with a position (but no size; it is not drawn)
     """
@@ -102,6 +102,22 @@ class Label(PositionableImpl, RepeatableImpl, AnnotatableImpl, Bounded, Pivotabl
         self.translate(+pivot)
         return self
 
+    def flip_across(self, axis: int | None = None, *, x: float | None = None, y: float | None = None) -> Self:
+        """
+        Mirror the object across a line.
+
+        Args:
+            axis: Axis to mirror across. 0 mirrors across x=0. 1 mirrors across y=0.
+            x: Vertical line x=val to mirror across.
+            y: Horizontal line y=val to mirror across.
+
+        Returns:
+            self
+        """
+        if self.repetition is not None:
+            self.repetition.flip_across(axis=axis, x=x, y=y)
+        return self
+
     def get_bounds_single(self) -> NDArray[numpy.float64]:
         """
         Return the bounds of the label.
diff --git a/masque/pattern.py b/masque/pattern.py
index dc7d058..42f9ab4 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -733,50 +733,31 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
             cast('Rotatable', entry).rotate(rotation)
         return self
 
-    def mirror_element_centers(self, across_axis: int = 0) -> Self:
+    def mirror_elements(self, across_axis: int = 0) -> Self:
         """
-        Mirror the offsets of all shapes, labels, and refs across an axis
+        Mirror each shape, ref, and port relative to (0,0).
 
         Args:
             across_axis: Axis to mirror across
                 (0: mirror across x axis, 1: mirror across y axis)
 
+        Returns:
+            self
+        """
+        return self.flip_across(axis=across_axis)
+
+    def mirror(self, axis: int = 0) -> Self:
+        """
+        Mirror the Pattern across an axis through its origin.
+
+        Args:
+            axis: Axis to mirror across (0: x-axis, 1: y-axis).
+
         Returns:
             self
         """
         for entry in chain(chain_elements(self.shapes, self.refs, self.labels), self.ports.values()):
-            cast('Positionable', entry).offset[1 - across_axis] *= -1
-        return self
-
-    def mirror_elements(self, across_axis: int = 0) -> Self:
-        """
-        Mirror each shape, ref, and pattern across an axis, relative
-          to its offset
-
-        Args:
-            across_axis: Axis to mirror across
-                (0: mirror across x axis, 1: mirror across y axis)
-
-        Returns:
-            self
-        """
-        for entry in chain(chain_elements(self.shapes, self.refs), self.ports.values()):
-            cast('Mirrorable', entry).mirror(across_axis)
-        return self
-
-    def mirror(self, across_axis: int = 0) -> Self:
-        """
-        Mirror the Pattern across an axis
-
-        Args:
-            across_axis: Axis to mirror across
-                (0: mirror across x axis, 1: mirror across y axis)
-
-        Returns:
-            self
-        """
-        self.mirror_elements(across_axis)
-        self.mirror_element_centers(across_axis)
+            cast('Flippable', entry).flip_across(axis=axis)
         return self
 
     def copy(self) -> Self:
diff --git a/masque/ports.py b/masque/ports.py
index 0211723..c0f7ddc 100644
--- a/masque/ports.py
+++ b/masque/ports.py
@@ -10,7 +10,7 @@ import numpy
 from numpy import pi
 from numpy.typing import ArrayLike, NDArray
 
-from .traits import PositionableImpl, Rotatable, PivotableImpl, Copyable, Mirrorable
+from .traits import PositionableImpl, Rotatable, PivotableImpl, Copyable, Mirrorable, Flippable, FlippableImpl
 from .utils import rotate_offsets_around, rotation_matrix_2d
 from .error import PortError, format_stacktrace
 
@@ -19,7 +19,7 @@ logger = logging.getLogger(__name__)
 
 
 @functools.total_ordering
-class Port(PositionableImpl, Rotatable, PivotableImpl, Copyable, Mirrorable):
+class Port(PositionableImpl, Rotatable, PivotableImpl, Copyable, FlippableImpl):
     """
     A point at which a `Device` can be snapped to another `Device`.
 
diff --git a/masque/ref.py b/masque/ref.py
index b3a684c..75a27a8 100644
--- a/masque/ref.py
+++ b/masque/ref.py
@@ -16,6 +16,7 @@ from .repetition import Repetition
 from .traits import (
     PositionableImpl, RotatableImpl, ScalableImpl,
     Mirrorable, PivotableImpl, Copyable, RepeatableImpl, AnnotatableImpl,
+    Flippable, FlippableImpl,
     )
 
 
@@ -25,7 +26,7 @@ if TYPE_CHECKING:
 
 @functools.total_ordering
 class Ref(
-        PositionableImpl, RotatableImpl, ScalableImpl, Mirrorable,
+        FlippableImpl, PositionableImpl, RotatableImpl, ScalableImpl,
         PivotableImpl, Copyable, RepeatableImpl, AnnotatableImpl,
         ):
     """
diff --git a/masque/shapes/arc.py b/masque/shapes/arc.py
index 79411d6..9ae06ce 100644
--- a/masque/shapes/arc.py
+++ b/masque/shapes/arc.py
@@ -384,7 +384,6 @@ class Arc(PositionableImpl, Shape):
         return self
 
     def mirror(self, axis: int = 0) -> 'Arc':
-        self.offset[1 - axis] *= -1
         self.rotation *= -1
         self.rotation += axis * pi
         self.angles *= -1
diff --git a/masque/shapes/ellipse.py b/masque/shapes/ellipse.py
index 6699e53..8e3fd49 100644
--- a/masque/shapes/ellipse.py
+++ b/masque/shapes/ellipse.py
@@ -189,7 +189,6 @@ class Ellipse(PositionableImpl, Shape):
         return self
 
     def mirror(self, axis: int = 0) -> Self:
-        self.offset[1 - axis] *= -1
         self.rotation *= -1
         self.rotation += axis * pi
         return self
diff --git a/masque/shapes/shape.py b/masque/shapes/shape.py
index 90bca2b..1cf2846 100644
--- a/masque/shapes/shape.py
+++ b/masque/shapes/shape.py
@@ -6,8 +6,8 @@ import numpy
 from numpy.typing import NDArray, ArrayLike
 
 from ..traits import (
-    Rotatable, Mirrorable, Copyable, Scalable,
-    Positionable, PivotableImpl, RepeatableImpl, AnnotatableImpl,
+    Rotatable, Mirrorable, Copyable, Scalable, FlippableImpl,
+    Positionable, Pivotable, PivotableImpl, RepeatableImpl, AnnotatableImpl,
     )
 
 if TYPE_CHECKING:
@@ -26,8 +26,9 @@ normalized_shape_tuple = tuple[
 DEFAULT_POLY_NUM_VERTICES = 24
 
 
-class Shape(Positionable, Rotatable, Mirrorable, Copyable, Scalable,
-            PivotableImpl, RepeatableImpl, AnnotatableImpl, metaclass=ABCMeta):
+class Shape(Positionable, Rotatable, FlippableImpl, Copyable, Scalable,
+            AnnotatableImpl, RepeatableImpl, PivotableImpl, Pivotable,
+            metaclass=ABCMeta):
     """
     Class specifying functions common to all shapes.
     """
diff --git a/masque/shapes/text.py b/masque/shapes/text.py
index 78632f6..87293fc 100644
--- a/masque/shapes/text.py
+++ b/masque/shapes/text.py
@@ -70,6 +70,7 @@ class Text(PositionableImpl, RotatableImpl, Shape):
             *,
             offset: ArrayLike = (0.0, 0.0),
             rotation: float = 0.0,
+            mirrored: bool = False,
             repetition: Repetition | None = None,
             annotations: annotations_t = None,
             raw: bool = False,
@@ -80,6 +81,7 @@ class Text(PositionableImpl, RotatableImpl, Shape):
             self._string = string
             self._height = height
             self._rotation = rotation
+            self._mirrored = mirrored
             self._repetition = repetition
             self._annotations = annotations
         else:
@@ -87,6 +89,7 @@ class Text(PositionableImpl, RotatableImpl, Shape):
             self.string = string
             self.height = height
             self.rotation = rotation
+            self.mirrored = mirrored
             self.repetition = repetition
             self.annotations = annotations
         self.font_path = font_path
diff --git a/masque/traits/__init__.py b/masque/traits/__init__.py
index 7c7360c..cca38f3 100644
--- a/masque/traits/__init__.py
+++ b/masque/traits/__init__.py
@@ -26,7 +26,11 @@ from .scalable import (
     Scalable as Scalable,
     ScalableImpl as ScalableImpl,
     )
-from .mirrorable import Mirrorable as Mirrorable
+from .mirrorable import (
+    Mirrorable as Mirrorable,
+    Flippable as Flippable,
+    FlippableImpl as FlippableImpl,
+    )
 from .copyable import Copyable as Copyable
 from .annotatable import (
     Annotatable as Annotatable,
diff --git a/masque/traits/mirrorable.py b/masque/traits/mirrorable.py
index 6d4ec3c..fffa9c8 100644
--- a/masque/traits/mirrorable.py
+++ b/masque/traits/mirrorable.py
@@ -1,6 +1,14 @@
-from typing import Self
+from typing import Self, Any, TYPE_CHECKING, cast
 from abc import ABCMeta, abstractmethod
 
+import numpy
+from numpy.typing import ArrayLike, NDArray
+
+from ..error import MasqueError
+
+if TYPE_CHECKING:
+    from .positionable import Positionable
+
 
 class Mirrorable(metaclass=ABCMeta):
     """
@@ -11,10 +19,10 @@ class Mirrorable(metaclass=ABCMeta):
     @abstractmethod
     def mirror(self, axis: int = 0) -> Self:
         """
-        Mirror the entity across an axis.
+        Mirror the entity across an axis through its origin, ignoring its offset.
 
         Args:
-            axis: Axis to mirror across.
+            axis: Axis to mirror across (0: x-axis, 1: y-axis).
 
         Returns:
             self
@@ -23,10 +31,11 @@ class Mirrorable(metaclass=ABCMeta):
 
     def mirror2d(self, across_x: bool = False, across_y: bool = False) -> Self:
         """
-        Optionally mirror the entity across both axes
+        Optionally mirror the entity across both axes through its origin.
 
         Args:
-            axes: (mirror_across_x, mirror_across_y)
+            across_x: Mirror across x axis (flip y)
+            across_y: Mirror across y axis (flip x)
 
         Returns:
             self
@@ -38,30 +47,56 @@ class Mirrorable(metaclass=ABCMeta):
         return self
 
 
-#class MirrorableImpl(Mirrorable, metaclass=ABCMeta):
-#    """
-#    Simple implementation of `Mirrorable`
-#    """
-#    __slots__ = ()
-#
-#    _mirrored: NDArray[numpy.bool]
-#    """ Whether to mirror the instance across the x and/or y axes. """
-#
-#    #
-#    # Properties
-#    #
-#    # Mirrored property
-#    @property
-#    def mirrored(self) -> NDArray[numpy.bool]:
-#        """ Whether to mirror across the [x, y] axes, respectively """
-#        return self._mirrored
-#
-#    @mirrored.setter
-#    def mirrored(self, val: Sequence[bool]) -> None:
-#        if is_scalar(val):
-#            raise MasqueError('Mirrored must be a 2-element list of booleans')
-#        self._mirrored = numpy.array(val, dtype=bool)
-#
-#    #
-#    # Methods
-#    #
+class Flippable(metaclass=ABCMeta):
+    """
+    Trait class for entities which can be mirrored relative to an external line.
+    """
+    __slots__ = ()
+
+    @staticmethod
+    def _check_flip_args(axis: int | None = None, *, x: float | None = None, y: float | None = None) -> tuple[int, float]:
+        pivot = numpy.zeros(2)
+        if axis is not None:
+            if x is not None or y is not None:
+                raise MasqueError('Cannot specify both axis and x or y')
+            return axis, pivot
+        if x is not None:
+            if y is not None:
+                raise MasqueError('Cannot specify both x and y')
+            return 0, pivot + (x, 0)
+        if y is not None:
+            return 1, pivot + (0, y)
+        raise MasqueError('Must specify one of axis, x, or y')
+
+    @abstractmethod
+    def flip_across(self, axis: int | None = None, *, x: float | None = None, y: float | None = None) -> Self:
+        """
+        Mirror the object across a line.
+
+        Args:
+            axis: Axis to mirror across. 0 mirrors across x=0. 1 mirrors across y=0.
+            x: Vertical line x=val to mirror across.
+            y: Horizontal line y=val to mirror across.
+
+        Returns:
+            self
+        """
+        pass
+
+
+class FlippableImpl(Flippable, metaclass=ABCMeta):
+    """
+    Implementation of `Flippable` for objects which are `Mirrorable` and `Positionable`.
+    """
+    __slots__ = ()
+
+    offset: NDArray[numpy.float64]
+    """ `[x_offset, y_offset]` """
+
+    def flip_across(self, axis: int | None = None, *, x: float | None = None, y: float | None = None) -> Self:
+        axis, pivot = self._check_flip_args(axis=axis, x=x, y=y)
+        cast('Positionable', self).translate(-pivot)
+        cast('Mirrorable', self).mirror(axis)
+        self.offset[1 - axis] *= -1
+        cast('Positionable', self).translate(+pivot)
+        return self