diff --git a/exercise3/include/matrix.h b/exercise3/include/matrix.h
index bddc786..65697b6 100644
--- a/exercise3/include/matrix.h
+++ b/exercise3/include/matrix.h
@@ -11,12 +11,12 @@ public:
         T c0r0, T c0r1, T c0r2, T c0r3,
         T c1r0, T c1r1, T c1r2, T c1r3,
         T c2r0, T c2r1, T c2r2, T c2r3,
-        T c3r0, T c3r1, T c3r2, T c3r3,
+        T c3r0, T c3r1, T c3r2, T c3r3
     ) {
-        x = tiny_vec(c0r0, c0r1, c0r2, c0r3);
-        y = tiny_vec(c1r0, c1r1, c1r2, c1r3);
-        z = tiny_vec(c2r0, c2r1, c2r2, c2r3);
-        w = tiny_vec(c3r0, c3r1, c3r2, c3r3);
+        x = tiny_vec<T, 4>(c0r0, c0r1, c0r2, c0r3);
+        y = tiny_vec<T, 4>(c1r0, c1r1, c1r2, c1r3);
+        z = tiny_vec<T, 4>(c2r0, c2r1, c2r2, c2r3);
+        w = tiny_vec<T, 4>(c3r0, c3r1, c3r2, c3r3);
     }
 
     ~Matrix4() { }
@@ -26,12 +26,12 @@ public:
         T zero = T::value_type(0);
         T one = T::value_type(1);
 
-        Matrix4(
+        return Matrix4(
             one,  zero, zero, zero,
             zero, one,  zero, zero,
             zero, zero, one,  zero,
             zero, zero, zero,  one
-        )
+        );
     }
 
     static Matrix4 from_translation(tiny_vec<T, 3> v)
@@ -39,17 +39,17 @@ public:
         T zero = T::value_type(0);
         T one = T::value_type(1);
 
-        Matrix4(
+        return Matrix4(
             one,  zero, zero, zero,
             zero,  one, zero, zero,
             zero, zero,  one, zero,
-            v.x,   v.y,  v.z,  one,
-        )
+            v.x,   v.y,  v.z,  one
+        );
     }
 
     static Matrix4 from_scale(T s)
     {
-        from_non_uniform_scale(s, s, s)
+        return from_non_uniform_scale(s, s, s);
     }
 
     static Matrix4 from_non_uniform_scale(T x, T y, T z) 
@@ -57,12 +57,12 @@ public:
         T zero = T::value_type(0);
         T one = T::value_type(1);
 
-        Matrix4(
+        return Matrix4(
             x,    zero, zero, zero,
             zero, y,    zero, zero,
             zero, zero, z,    zero,
-            zero, zero, zero,  one,
-        )
+            zero, zero, zero,  one
+        );
     }
 
     static Matrix4 from_angle_x(T a)
@@ -73,12 +73,12 @@ public:
         T zero = T::value_type(0);
         T one = T::value_type(1);
 
-        Matrix4(
+        return Matrix4(
             one,  zero, zero, zero,
             zero,    c,    s, zero,
             zero,   -s,    c, zero,
-            zero, zero, zero,  one,
-        )
+            zero, zero, zero,  one
+        );
     }
     
     static Matrix4 from_angle_y(T a)
@@ -89,12 +89,12 @@ public:
         T zero = T::value_type(0);
         T one = T::value_type(1);
 
-        Matrix4(
+        return Matrix4(
             c,    zero,   -s, zero,
             zero, one,  zero, zero,
             s,    zero,    c, zero,
             zero, zero, zero,  one
-        )
+        );
     }
     
     static Matrix4 from_angle_z(T a)
@@ -105,12 +105,12 @@ public:
         T zero = T::value_type(0);
         T one = T::value_type(1);
 
-        Matrix4(
+        return Matrix4(
             c,       s, zero, zero,
             -s,      c, zero, zero,
             zero, zero,  one, zero,
             zero, zero, zero,  one
-        )
+        );
     }
     
 
@@ -123,4 +123,4 @@ private:
     tiny_vec<T, 4> z;
     // fourth column
     tiny_vec<T, 4> w;
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/exercise3/src/cube_system.cpp b/exercise3/src/cube_system.cpp
index 610fb86..7d0acad 100644
--- a/exercise3/src/cube_system.cpp
+++ b/exercise3/src/cube_system.cpp
@@ -4,6 +4,7 @@
 // Copyright (C) 2016 CGV TU Dresden - All Rights Reserved
 //
 #include "cube_system.h"
+#include "matrix.h"
 
 // Initialize variables
 cube_system::cube_system()
@@ -11,7 +12,26 @@ cube_system::cube_system()
 	angle = 0;
 }
 
-
+void render_cube_face(
+	const double color[3],
+	const double p0[3],
+	const double p1[3],
+	const double p2[3],
+	const double p3[3])
+{
+	glColor3dv(color);
+	glVertex3dv(p0);
+	glColor3dv(color);
+	glVertex3dv(p1);
+	glColor3dv(color);
+	glVertex3dv(p2);
+	glColor3dv(color);
+	glVertex3dv(p2);
+	glColor3dv(color);
+	glVertex3dv(p3);
+	glColor3dv(color);
+	glVertex3dv(p0);
+}
 
 // Setup the scene and render cube system
 void cube_system::render()
@@ -68,31 +88,55 @@ void cube_system::render_system()
 	// Remove the following statement (if wanted) as it just serves 2.1.1.
 	// Entfernen Sie die folgende Anweisung gegebenenfalls, da sie lediglich dem Testen
 	// von Aufgabe 2.1.1 dient.
-	render_cube();
+
+	glPushMatrix();
+		glRotatef(angle, 0.0f, 1.0f, 0.0f);
+		render_cube();
+	glPopMatrix();
+
+	glPushMatrix();
+		glRotatef(-angle, 0.0f, 1.0f, 0.0f);
+
+		glPushMatrix();
+			glTranslatef(5.0f, 0.0, 0.0);
+
+			glPushMatrix();
+				glScalef(0.6f, 0.6f, 0.6f);
+
+				glPushMatrix();
+					glRotatef(2 * angle, 0.0f , 0.0f, 1.0f);
+
+					glPushMatrix();
+						glTranslatef(3.0f, 0.0f, 0.0f);
+
+						glPushMatrix();
+							glScalef(0.5f, 0.5f, 0.5f);
+							render_cube();
+						glPopMatrix();
+					glPopMatrix();
+				glPopMatrix();
+
+				render_cube();
+
+				glPushMatrix();
+					glRotatef(2*angle + 180.0f, 0.0f, 0.0f, 1.0f);
+
+					glPushMatrix();
+						glTranslatef(3.0f, 0.0f, 0.0f);
+
+						glPushMatrix();
+							glScalef(0.5f, 0.5f, 0.5f);
+							render_cube();
+						glPopMatrix();
+					glPopMatrix();
+				glPopMatrix();
+			glPopMatrix();
+		glPopMatrix();
+	glPopMatrix();
 }
 
 
 
-void render_cube_face(
-	const double color[3],
-	const double p0[3],
-	const double p1[3],
-	const double p2[3],
-	const double p3[3])
-{
-	glColor3dv(color);
-	glVertex3dv(p0);
-	glColor3dv(color);
-	glVertex3dv(p1);
-	glColor3dv(color);
-	glVertex3dv(p2);
-	glColor3dv(color);
-	glVertex3dv(p2);
-	glColor3dv(color);
-	glVertex3dv(p3);
-	glColor3dv(color);
-	glVertex3dv(p0);
-}
 
 // Render one single cube
 void cube_system::render_cube()