diff --git a/src/viser/__init__.py b/src/viser/__init__.py
index 3fdd5522..99a6f38a 100644
--- a/src/viser/__init__.py
+++ b/src/viser/__init__.py
@@ -33,6 +33,8 @@
 from ._scene_handles import SceneNodeHandle as SceneNodeHandle
 from ._scene_handles import SceneNodePointerEvent as SceneNodePointerEvent
 from ._scene_handles import ScenePointerEvent as ScenePointerEvent
+from ._scene_handles import SplineCatmullRomHandle as SplineCatmullRomHandle
+from ._scene_handles import SplineCubicBezierHandle as SplineCubicBezierHandle
 from ._scene_handles import SpotLightHandle as SpotLightHandle
 from ._scene_handles import TransformControlsHandle as TransformControlsHandle
 from ._viser import CameraHandle as CameraHandle
diff --git a/src/viser/_messages.py b/src/viser/_messages.py
index bafce2f4..6956c63e 100644
--- a/src/viser/_messages.py
+++ b/src/viser/_messages.py
@@ -96,12 +96,23 @@ class NotificationMessage(Message):
 
     mode: Literal["show", "update"]
     id: str
+    props: NotificationProps
+
+
+@dataclasses.dataclass
+class NotificationProps:
     title: str
+    """Title of the notification. For handles, synchronized automatically when assigned."""
     body: str
+    """Body text of the notification. For handles, synchronized automatically when assigned."""
     loading: bool
+    """Whether to show a loading indicator. For handles, synchronized automatically when assigned."""
     with_close_button: bool
+    """Whether to show a close button. For handles, synchronized automatically when assigned."""
     auto_close: Union[int, Literal[False]]
+    """Time in milliseconds after which the notification should auto-close, or False to disable auto-close. For handles, synchronized automatically when assigned."""
     color: Optional[Color]
+    """Color of the notification. For handles, synchronized automatically when assigned."""
 
 
 @dataclasses.dataclass
@@ -970,7 +981,7 @@ def redundancy_key(self) -> str:
 
 @dataclasses.dataclass
 class SceneNodeUpdateMessage(Message):
-    """Sent client<->server when any property of a GUI component is changed."""
+    """Sent client<->server when any property of a scene node is changed."""
 
     name: str
     updates: Annotated[
diff --git a/src/viser/_notification_handle.py b/src/viser/_notification_handle.py
index 0292af82..60a8f379 100644
--- a/src/viser/_notification_handle.py
+++ b/src/viser/_notification_handle.py
@@ -1,10 +1,9 @@
 from __future__ import annotations
 
 import dataclasses
-from typing import Literal
+from typing import TYPE_CHECKING, Any, Literal
 
-from ._gui_api import Color
-from ._messages import NotificationMessage, RemoveNotificationMessage
+from ._messages import NotificationMessage, NotificationProps, RemoveNotificationMessage
 from .infra._infra import WebsockClientConnection
 
 
@@ -12,113 +11,37 @@
 class _NotificationHandleState:
     websock_interface: WebsockClientConnection
     id: str
-    title: str
-    body: str
-    loading: bool
-    with_close_button: bool
-    auto_close: int | Literal[False]
-    color: Color | None
+    props: NotificationProps
 
 
-@dataclasses.dataclass
-class NotificationHandle:
+class NotificationHandle(NotificationProps):
     """Handle for a notification in our visualizer."""
 
-    _impl: _NotificationHandleState
-
-    def _sync_with_client(self, first: bool = False) -> None:
-        m = NotificationMessage(
-            "show" if first else "update",
-            self._impl.id,
-            self._impl.title,
-            self._impl.body,
-            self._impl.loading,
-            self._impl.with_close_button,
-            self._impl.auto_close,
-            self._impl.color,
-        )
-        self._impl.websock_interface.queue_message(m)
-
-    @property
-    def title(self) -> str:
-        """Title to display on the notification."""
-        return self._impl.title
-
-    @title.setter
-    def title(self, title: str) -> None:
-        if title == self._impl.title:
-            return
-
-        self._impl.title = title
-        self._sync_with_client()
-
-    @property
-    def body(self) -> str:
-        """Message to display on the notification body."""
-        return self._impl.body
-
-    @body.setter
-    def body(self, body: str) -> None:
-        if body == self._impl.body:
-            return
-
-        self._impl.body = body
-        self._sync_with_client()
-
-    @property
-    def loading(self) -> bool:
-        """Whether the notification shows loading icon."""
-        return self._impl.loading
-
-    @loading.setter
-    def loading(self, loading: bool) -> None:
-        if loading == self._impl.loading:
-            return
-
-        self._impl.loading = loading
-        self._sync_with_client()
-
-    @property
-    def with_close_button(self) -> bool:
-        """Whether the notification can be manually closed."""
-        return self._impl.with_close_button
-
-    @with_close_button.setter
-    def with_close_button(self, with_close_button: bool) -> None:
-        if with_close_button == self._impl.with_close_button:
-            return
-
-        self._impl.with_close_button = with_close_button
-        self._sync_with_client()
-
-    @property
-    def auto_close(self) -> int | Literal[False]:
-        """Time in ms before the notification automatically closes;
-        otherwise False such that the notification never closes on its own."""
-        return self._impl.auto_close
-
-    @auto_close.setter
-    def auto_close(self, auto_close: int | Literal[False]) -> None:
-        if auto_close == self._impl.auto_close:
-            return
+    def __init__(self, impl: _NotificationHandleState) -> None:
+        self._impl = impl
 
-        self._impl.auto_close = auto_close
-        self._sync_with_client()
+    # Support property-style read/write. Similar to `_OverridableScenePropApi`.
+    if not TYPE_CHECKING:
 
-    @property
-    def color(self) -> Color | None:
-        """Color of the notification."""
-        return self._impl.color
+        def __setattr__(self, name: str, value: Any) -> None:
+            if name in NotificationProps.__annotations__:
+                setattr(self._impl.props, name, value)
+                self._sync_with_client("update")
+            else:
+                return object.__setattr__(self, name, value)
 
-    @color.setter
-    def color(self, color: Color | None) -> None:
-        if color == self._impl.color:
-            return
+        def __getattr__(self, name: str) -> Any:
+            if name in NotificationProps.__annotations__:
+                return getattr(self._impl.props, name)
+            else:
+                raise AttributeError(
+                    f"'{self.__class__.__name__}' object has no attribute '{name}'"
+                )
 
-        self._impl.color = color
-        self._sync_with_client()
+    def _sync_with_client(self, mode: Literal["show", "update"]) -> None:
+        msg = NotificationMessage(mode, self._impl.id, self._impl.props)
+        self._impl.websock_interface.queue_message(msg)
 
     def remove(self) -> None:
-        self._impl.websock_interface.queue_message(
-            RemoveNotificationMessage(self._impl.id)
-        )
+        msg = RemoveNotificationMessage(self._impl.id)
+        self._impl.websock_interface.queue_message(msg)
diff --git a/src/viser/_scene_handles.py b/src/viser/_scene_handles.py
index 7cc20e04..70505c68 100644
--- a/src/viser/_scene_handles.py
+++ b/src/viser/_scene_handles.py
@@ -40,7 +40,7 @@ def colors_to_uint8(colors: onp.ndarray) -> onpt.NDArray[onp.uint8]:
     return colors
 
 
-class _OverridablePropSettersAndGetters:
+class _OverridablePropScenePropSettersAndGetters:
     def __setattr__(self, name: str, value: Any) -> None:
         handle = cast(SceneNodeHandle, self)
         # Get the value of the T TypeVar.
@@ -68,8 +68,8 @@ def __getattr__(self, name: str) -> Any:
             )
 
 
-class _OverridablePropApi(
-    _OverridablePropSettersAndGetters if not TYPE_CHECKING else object
+class _OverridableScenePropApi(
+    _OverridablePropScenePropSettersAndGetters if not TYPE_CHECKING else object
 ):
     """Mixin that allows reading/assigning properties defined in each scene node message."""
 
@@ -270,7 +270,7 @@ def on_click(
 class CameraFrustumHandle(
     _ClickableSceneNodeHandle,
     _messages.CameraFrustumProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.CameraFrustumProps,
 ):
     """Handle for camera frustums."""
@@ -279,7 +279,7 @@ class CameraFrustumHandle(
 class DirectionalLightHandle(
     SceneNodeHandle,
     _messages.DirectionalLightProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.DirectionalLightProps,
 ):
     """Handle for directional lights."""
@@ -288,7 +288,7 @@ class DirectionalLightHandle(
 class AmbientLightHandle(
     SceneNodeHandle,
     _messages.AmbientLightProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.AmbientLightProps,
 ):
     """Handle for ambient lights."""
@@ -297,7 +297,7 @@ class AmbientLightHandle(
 class HemisphereLightHandle(
     SceneNodeHandle,
     _messages.HemisphereLightProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.HemisphereLightProps,
 ):
     """Handle for hemisphere lights."""
@@ -306,7 +306,7 @@ class HemisphereLightHandle(
 class PointLightHandle(
     SceneNodeHandle,
     _messages.PointLightProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.PointLightProps,
 ):
     """Handle for point lights."""
@@ -315,7 +315,7 @@ class PointLightHandle(
 class RectAreaLightHandle(
     SceneNodeHandle,
     _messages.RectAreaLightProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.RectAreaLightProps,
 ):
     """Handle for rectangular area lights."""
@@ -324,7 +324,7 @@ class RectAreaLightHandle(
 class SpotLightHandle(
     SceneNodeHandle,
     _messages.SpotLightProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.SpotLightProps,
 ):
     """Handle for spot lights."""
@@ -333,7 +333,7 @@ class SpotLightHandle(
 class PointCloudHandle(
     SceneNodeHandle,
     _messages.PointCloudProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.PointCloudProps,
 ):
     """Handle for point clouds. Does not support click events."""
@@ -342,7 +342,7 @@ class PointCloudHandle(
 class BatchedAxesHandle(
     _ClickableSceneNodeHandle,
     _messages.BatchedAxesProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.BatchedAxesProps,
 ):
     """Handle for batched coordinate frames."""
@@ -351,7 +351,7 @@ class BatchedAxesHandle(
 class FrameHandle(
     _ClickableSceneNodeHandle,
     _messages.FrameProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.FrameProps,
 ):
     """Handle for coordinate frames."""
@@ -360,7 +360,7 @@ class FrameHandle(
 class MeshHandle(
     _ClickableSceneNodeHandle,
     _messages.MeshProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.MeshProps,
 ):
     """Handle for mesh objects."""
@@ -369,7 +369,7 @@ class MeshHandle(
 class GaussianSplatHandle(
     _ClickableSceneNodeHandle,
     _messages.GaussianSplatsProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.GaussianSplatsProps,
 ):
     """Handle for Gaussian splatting objects.
@@ -381,7 +381,7 @@ class GaussianSplatHandle(
 class MeshSkinnedHandle(
     _ClickableSceneNodeHandle,
     _messages.SkinnedMeshProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.SkinnedMeshProps,
 ):
     """Handle for skinned mesh objects."""
@@ -450,7 +450,7 @@ def position(self, position: tuple[float, float, float] | onp.ndarray) -> None:
 class GridHandle(
     SceneNodeHandle,
     _messages.GridProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.GridProps,
 ):
     """Handle for grid objects."""
@@ -459,7 +459,7 @@ class GridHandle(
 class SplineCatmullRomHandle(
     SceneNodeHandle,
     _messages.CatmullRomSplineProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.CatmullRomSplineProps,
 ):
     """Handle for Catmull-Rom splines."""
@@ -468,7 +468,7 @@ class SplineCatmullRomHandle(
 class SplineCubicBezierHandle(
     SceneNodeHandle,
     _messages.CubicBezierSplineProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.CubicBezierSplineProps,
 ):
     """Handle for cubic Bezier splines."""
@@ -477,7 +477,7 @@ class SplineCubicBezierHandle(
 class GlbHandle(
     _ClickableSceneNodeHandle,
     _messages.GlbProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.GlbProps,
 ):
     """Handle for GLB objects."""
@@ -486,7 +486,7 @@ class GlbHandle(
 class ImageHandle(
     _ClickableSceneNodeHandle,
     _messages.ImageProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.ImageProps,
 ):
     """Handle for 2D images, rendered in 3D."""
@@ -495,7 +495,7 @@ class ImageHandle(
 class LabelHandle(
     SceneNodeHandle,
     _messages.LabelProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.LabelProps,
 ):
     """Handle for 2D label objects. Does not support click events."""
@@ -511,7 +511,7 @@ class _TransformControlsState:
 class TransformControlsHandle(
     _ClickableSceneNodeHandle,
     _messages.TransformControlsProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.TransformControlsProps,
 ):
     """Handle for interacting with transform control gizmos."""
@@ -535,7 +535,7 @@ def on_update(
 class Gui3dContainerHandle(
     SceneNodeHandle,
     _messages.Gui3DProps,
-    _OverridablePropApi,
+    _OverridableScenePropApi,
     PropClass=_messages.Gui3DProps,
 ):
     """Use as a context to place GUI elements into a 3D GUI container."""
diff --git a/src/viser/_viser.py b/src/viser/_viser.py
index 5b2d9b94..e56110fc 100644
--- a/src/viser/_viser.py
+++ b/src/viser/_viser.py
@@ -418,15 +418,17 @@ def add_notification(
             _NotificationHandleState(
                 websock_interface=self._websock_connection,
                 id=_make_unique_id(),
-                title=title,
-                body=body,
-                loading=loading,
-                with_close_button=with_close_button,
-                auto_close=auto_close,
-                color=color,
+                props=_messages.NotificationProps(
+                    title=title,
+                    body=body,
+                    loading=loading,
+                    with_close_button=with_close_button,
+                    auto_close=auto_close,
+                    color=color,
+                ),
             )
         )
-        handle._sync_with_client(first=True)
+        handle._sync_with_client("show")
         return handle
 
 
diff --git a/src/viser/client/src/MessageHandler.tsx b/src/viser/client/src/MessageHandler.tsx
index 895a38e5..6196f053 100644
--- a/src/viser/client/src/MessageHandler.tsx
+++ b/src/viser/client/src/MessageHandler.tsx
@@ -133,27 +133,15 @@ function useMessageHandler() {
 
       // Add a notification.
       case "NotificationMessage": {
-        if (message.mode === "show") {
-          notifications.show({
-            id: message.id,
-            title: message.title,
-            message: message.body,
-            withCloseButton: message.with_close_button,
-            loading: message.loading,
-            autoClose: message.auto_close,
-            color: message.color ?? undefined,
-          });
-        } else if (message.mode === "update") {
-          notifications.update({
-            id: message.id,
-            title: message.title,
-            message: message.body,
-            withCloseButton: message.with_close_button,
-            loading: message.loading,
-            autoClose: message.auto_close,
-            color: message.color ?? undefined,
-          });
-        }
+        (message.mode === "show" ? notifications.show : notifications.update)({
+          id: message.id,
+          title: message.props.title,
+          message: message.props.body,
+          withCloseButton: message.props.with_close_button,
+          loading: message.props.loading,
+          autoClose: message.props.auto_close,
+          color: message.props.color ?? undefined,
+        });
         return;
       }
 
diff --git a/src/viser/client/src/WebsocketMessages.ts b/src/viser/client/src/WebsocketMessages.ts
index 4f1bfb73..a78ba205 100644
--- a/src/viser/client/src/WebsocketMessages.ts
+++ b/src/viser/client/src/WebsocketMessages.ts
@@ -18,27 +18,29 @@ export interface NotificationMessage {
   type: "NotificationMessage";
   mode: "show" | "update";
   id: string;
-  title: string;
-  body: string;
-  loading: boolean;
-  with_close_button: boolean;
-  auto_close: number | false;
-  color:
-    | "dark"
-    | "gray"
-    | "red"
-    | "pink"
-    | "grape"
-    | "violet"
-    | "indigo"
-    | "blue"
-    | "cyan"
-    | "green"
-    | "lime"
-    | "yellow"
-    | "orange"
-    | "teal"
-    | null;
+  props: {
+    title: string;
+    body: string;
+    loading: boolean;
+    with_close_button: boolean;
+    auto_close: number | false;
+    color:
+      | "dark"
+      | "gray"
+      | "red"
+      | "pink"
+      | "grape"
+      | "violet"
+      | "indigo"
+      | "blue"
+      | "cyan"
+      | "green"
+      | "lime"
+      | "yellow"
+      | "orange"
+      | "teal"
+      | null;
+  };
 }
 /** Remove a specific notification.
  *
@@ -928,7 +930,7 @@ export interface GuiUpdateMessage {
   id: string;
   updates: Partial<GuiAddComponentMessage>;
 }
-/** Sent client<->server when any property of a GUI component is changed.
+/** Sent client<->server when any property of a scene node is changed.
  *
  * (automatically generated)
  */