diff --git a/active_projects/ode/all_part1_scenes.py b/active_projects/ode/all_part1_scenes.py
new file mode 100644
index 00000000..5e117116
--- /dev/null
+++ b/active_projects/ode/all_part1_scenes.py
@@ -0,0 +1,6 @@
+# from active_projects.ode.part1 import *
+
+OUTPUT_DIRECTORY = "ode/part1"
+ALL_SCENE_CLASSES = [
+
+]
diff --git a/active_projects/ode/part1/pendulum.py b/active_projects/ode/part1/pendulum.py
new file mode 100644
index 00000000..76af75a2
--- /dev/null
+++ b/active_projects/ode/part1/pendulum.py
@@ -0,0 +1,50 @@
+from big_ol_pile_of_manim_imports import *
+
+
+class Pendulum(VGroup):
+    CONFIG = {
+        "length": 3,
+        "gravity": 9.8,
+        "weight_diameter": 0.5,
+        "rod_style": {
+            "stroke_width": 2,
+            "stroke_color": LIGHT_GREY,
+        },
+        "weight_style": {
+            "stroke_width": 0,
+            "fill_opacity": 1,
+            "fill_color": LIGHT_GREY,
+            "sheen_direction": UL,
+            "sheen_factor": 0.5,
+        }
+    }
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.create_rod()
+
+    def create_rod(self):
+        pass
+
+    def create_weight(self):
+        pass
+
+    def get_theta(self):
+        pass
+
+    def set_theta(self):
+        pass
+
+    def get_angular_velocity(self):
+        pass
+
+    def set_angular_velocity(self):
+        pass
+
+    def get_fixed_point(self):
+        pass
+
+
+class PendulumTest(Scene):
+    def construct(self):
+        pass
diff --git a/manimlib/mobject/matrix.py b/manimlib/mobject/matrix.py
index b5a2e283..f4f31913 100644
--- a/manimlib/mobject/matrix.py
+++ b/manimlib/mobject/matrix.py
@@ -99,7 +99,7 @@ class Matrix(VMobject):
         return self
 
     def add_brackets(self):
-        bracket_pair = TexMobject("\\big[ \\big]")
+        bracket_pair = TexMobject("\\big[", "\\big]")
         bracket_pair.scale(2)
         bracket_pair.stretch_to_fit_height(self.get_height() + 0.5)
         l_bracket, r_bracket = bracket_pair.split()