diff --git a/masque/builder/builder.py b/masque/builder/builder.py
index bc837f6..1fbbe88 100644
--- a/masque/builder/builder.py
+++ b/masque/builder/builder.py
@@ -192,27 +192,22 @@ class Builder(PortList):
     @wraps(Pattern.label)
     def label(self, *args, **kwargs) -> Self:
         self.pattern.label(*args, **kwargs)
-        return self
 
     @wraps(Pattern.ref)
     def ref(self, *args, **kwargs) -> Self:
         self.pattern.ref(*args, **kwargs)
-        return self
 
     @wraps(Pattern.polygon)
     def polygon(self, *args, **kwargs) -> Self:
         self.pattern.polygon(*args, **kwargs)
-        return self
 
     @wraps(Pattern.rect)
     def rect(self, *args, **kwargs) -> Self:
         self.pattern.rect(*args, **kwargs)
-        return self
 
     @wraps(Pattern.path)
     def path(self, *args, **kwargs) -> Self:
         self.pattern.path(*args, **kwargs)
-        return self
 
     def plug(
             self,
diff --git a/masque/pattern.py b/masque/pattern.py
index 0d98164..bb077be 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -87,7 +87,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
     __slots__ = (
         'shapes', 'labels', 'refs', '_ports',
         # inherited
-        '_annotations',
+        '_offset', '_annotations',
         )
 
     shapes: defaultdict[layer_t, list[Shape]]
diff --git a/masque/shapes/shape.py b/masque/shapes/shape.py
index 4263531..d65c05b 100644
--- a/masque/shapes/shape.py
+++ b/masque/shapes/shape.py
@@ -1,4 +1,4 @@
-from typing import Callable, TYPE_CHECKING, Any
+from typing import Callable, Self, TYPE_CHECKING
 from abc import ABCMeta, abstractmethod
 
 import numpy
@@ -32,12 +32,12 @@ class Shape(PositionableImpl, Rotatable, Mirrorable, Copyable, Scalable,
     """
     __slots__ = ()      # Children should use AutoSlots or set slots themselves
 
-    #def __copy__(self) -> Self:
-    #    cls = self.__class__
-    #    new = cls.__new__(cls)
-    #    for name in self.__slots__:     # type: str
-    #        object.__setattr__(new, name, getattr(self, name))
-    #    return new
+    def __copy__(self) -> Self:
+        cls = self.__class__
+        new = cls.__new__(cls)
+        for name in self.__slots__:     # type: str
+            object.__setattr__(new, name, getattr(self, name))
+        return new
 
     #
     # Methods (abstract)