diff --git a/src/Vtk/Math/testing/vtkContainerBoxTest.cpp b/src/Vtk/Math/testing/vtkContainerBoxTest.cpp
index f524b2a..1804776 100644
--- a/src/Vtk/Math/testing/vtkContainerBoxTest.cpp
+++ b/src/Vtk/Math/testing/vtkContainerBoxTest.cpp
@@ -25,7 +25,6 @@
 
 #include "Vtk/uLibVtkViewer.h"
 
-#include "Vtk/Math/vtkContainerBox.h"
 #include "Math/Units.h"
 #include "Vtk/Math/vtkContainerBox.h"
 
@@ -36,19 +35,23 @@ using namespace uLib;
 int main() {
   BEGIN_TESTING(vtk ContainerBox Test);
 
-  ContainerBox box;
-  box.Scale(Vector3f(1_m,2_m,1_m));
-  box.SetPosition(Vector3f(0,0,0));
-  
-  Vtk::ContainerBox v_box(&box);
-  v_box.Update();
-  
-  // v_box.SetRepresentation(Vtk::Prop3D::Surface);
-  // v_box.SetOpacity(0.5);
-  // v_box.SetSelectable(true);
-  
-  box.findOrAddSignal(&Object::Updated)->connect([&box](){
-    std::cout << "box updated: " << box.GetWorldPoint(HPoint3f(1,1,1)) << std::endl;
+  {
+    ContainerBox box;
+    box.Scale(Vector3f(1_m, 2_m, 1_m));
+    box.SetPosition(Vector3f(0, 0, 0));
+
+    Vtk::ContainerBox v_box(&box);
+    v_box.Update();
+
+    v_box.SetRepresentation(Vtk::Prop3D::Surface);
+    v_box.SetOpacity(0.5);
+    v_box.SetSelectable(true);
+  }
+
+  Vtk::ContainerBox v_box;
+  v_box.findOrAddSignal(&Object::Updated)->connect([&v_box]() {
+    std::cout << "box updated: "
+              << v_box.get()->GetWorldPoint(HPoint3f(1, 1, 1)) << std::endl;
   });
 
   if (std::getenv("CTEST_PROJECT_NAME") == nullptr) {
diff --git a/src/Vtk/Math/vtkContainerBox.cpp b/src/Vtk/Math/vtkContainerBox.cpp
index d969617..ac9bf89 100644
--- a/src/Vtk/Math/vtkContainerBox.cpp
+++ b/src/Vtk/Math/vtkContainerBox.cpp
@@ -43,50 +43,43 @@
 
 #include "Vtk/Math/vtkDense.h"
 
-
 namespace uLib {
 namespace Vtk {
 
 struct ContainerBoxData {
-  vtkSmartPointer<vtkActor>     m_Cube;
-  vtkSmartPointer<vtkActor>     m_Axes;
-  vtkSmartPointer<vtkAssembly>  m_VtkAsm;
-  uLib::Connection              m_UpdateSignal;
+  vtkSmartPointer<vtkActor> m_Cube;
+  vtkSmartPointer<vtkActor> m_Axes;
+  vtkSmartPointer<vtkAssembly> m_VtkAsm;
+  uLib::Connection m_UpdateSignal;
 
-
-  ContainerBoxData() : m_Cube(vtkSmartPointer<vtkActor>::New()), 
-                       m_Axes(vtkSmartPointer<vtkActor>::New()), 
-                       m_VtkAsm(vtkSmartPointer<vtkAssembly>::New()) {}
-  ~ContainerBoxData() {
-  }
+  ContainerBoxData()
+      : m_Cube(vtkSmartPointer<vtkActor>::New()),
+        m_Axes(vtkSmartPointer<vtkActor>::New()),
+        m_VtkAsm(vtkSmartPointer<vtkAssembly>::New()) {}
+  ~ContainerBoxData() {}
 };
 
-
-
-
-
 ContainerBox::ContainerBox(ContainerBox::Content *content)
-    : d(new ContainerBoxData()), ObjectWrapper(content) {
+    : d(new ContainerBoxData()),
+      ObjectWrapper(content ? content : new Content()) {
   this->InstallPipe();
-  d->m_UpdateSignal =
-      Object::connect(this->m_model.get(), &uLib::Object::Updated, this, &ContainerBox::Update);
+  d->m_UpdateSignal = Object::connect(
+      this->m_model.get(), &uLib::Object::Updated, this, &ContainerBox::Update);
 }
 
-ContainerBox::~ContainerBox() {
-  delete d;
-}
+ContainerBox::~ContainerBox() { delete d; }
 
 vtkPolyData *ContainerBox::GetPolyData() const {
   // TODO
   return NULL;
 }
 
-
 void ContainerBox::Update() {
   RecursiveMutex::ScopedLock lock(this->m_UpdateMutex);
-  if (!this->m_model) return;
+  if (!this->m_model)
+    return;
 
-  vtkProp3D* prop = vtkProp3D::SafeDownCast(this->GetProp());
+  vtkProp3D *prop = vtkProp3D::SafeDownCast(this->GetProp());
   if (prop) {
     // Apply the full volume matrix (TRS * m_LocalT)
     vtkNew<vtkMatrix4x4> m;
@@ -100,32 +93,28 @@ void ContainerBox::Update() {
   this->Prop3D::Update();
 }
 
-
-
-
 void ContainerBox::SyncFromVtk() {
   RecursiveMutex::ScopedLock lock(this->m_UpdateMutex);
-  if (!this->m_model) return;
+  if (!this->m_model)
+    return;
 
-  vtkProp3D* root = this->GetProxyProp();
-  if (!root) return;
+  vtkProp3D *root = this->GetProxyProp();
+  if (!root)
+    return;
 
-  // VTK -> Model: Extract new world TRS from proxy, which matches the model's TRS center
-  vtkMatrix4x4* rootMat = root->GetUserMatrix();
+  // VTK -> Model: Extract new world TRS from proxy, which matches the model's
+  // TRS center
+  vtkMatrix4x4 *rootMat = root->GetUserMatrix();
   Matrix4f vtkWorld = VtkToMatrix4f(rootMat);
-  
+
   // Synchronize TRS property members from the updated local matrix
   this->m_model->FromMatrix(vtkWorld);
 
-  // Since we modified the model, notify observers, but block the loop back to VTK
-  // ConnectionBlock blocker(d->m_UpdateSignal);
+  // Since we modified the model, notify observers, but block the loop back to
+  // VTK ConnectionBlock blocker(d->m_UpdateSignal);
   this->m_model->Updated();
 }
 
-
-
-
-
 void ContainerBox::InstallPipe() {
   if (!this->m_model)
     return;
@@ -133,7 +122,7 @@ void ContainerBox::InstallPipe() {
 
   // CUBE
   vtkSmartPointer<vtkCubeSource> cube = vtkSmartPointer<vtkCubeSource>::New();
-  
+
   vtkSmartPointer<vtkPolyDataMapper> mapper =
       vtkSmartPointer<vtkPolyDataMapper>::New();
   cube->SetBounds(0, 1, 0, 1, 0, 1);
@@ -160,11 +149,11 @@ void ContainerBox::InstallPipe() {
   mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
   mapper->SetInputConnection(axes->GetOutputPort());
   mapper->Update();
-  
+
   d->m_VtkAsm->AddPart(d->m_Cube);
   d->m_VtkAsm->AddPart(d->m_Axes);
   this->SetProp(d->m_VtkAsm);
-  
+
   // vtkProp3D* root = d->m_VtkAsm;
   // if (root) {
   //     this->ApplyProp3DTransform(root);
diff --git a/src/Vtk/Math/vtkContainerBox.h b/src/Vtk/Math/vtkContainerBox.h
index f84bb7e..bc4a653 100644
--- a/src/Vtk/Math/vtkContainerBox.h
+++ b/src/Vtk/Math/vtkContainerBox.h
@@ -42,11 +42,11 @@ class ContainerBox : public Prop3D,
                      public Polydata,
                      public uLib::ObjectWrapper<uLib::ContainerBox> {
 
-  uLibTypeMacro(ContainerBox, Prop3D, Polydata)
-  typedef uLib::ContainerBox Content;
+  uLibTypeMacro(ContainerBox, Prop3D,
+                Polydata) typedef uLib::ContainerBox Content;
 
 public:
-  ContainerBox(Content *content);
+  ContainerBox(Content *content = nullptr);
   ~ContainerBox();
 
   virtual class vtkPolyData *GetPolyData() const override;