diff --git a/active_projects/eop/birthday.py b/active_projects/eop/birthday.py
new file mode 100644
index 00000000..f59f7021
--- /dev/null
+++ b/active_projects/eop/birthday.py
@@ -0,0 +1,47 @@
+from helpers import *
+from mobject import Mobject
+from mobject.vectorized_mobject import *
+from animation.animation import Animation
+from animation.transform import *
+from animation.simple_animations import *
+from topics.geometry import *
+from scene import Scene
+from camera import *
+from topics.number_line import *
+from topics.three_dimensions import *
+from topics.light import *
+from topics.characters import *
+from topics.numerals import *
+
+
+
+class Birthday(Scene):
+
+    def construct(self):
+
+        sidelength = 6.0
+        corner = np.array([-sidelength/2,-sidelength/2,0])
+        nb_days_left = 365.0
+        toggle = False
+
+        def probability():
+            width = rect.get_width()
+            height = rect.get_height()
+            return width * height / sidelength**2
+
+        rect = Square().scale(sidelength/2)
+
+        while probability() > 0.5:
+
+            self.add(rect.copy())
+            nb_days_left -= 1
+
+            if toggle:
+                dim = 0
+            else:
+                dim = 1
+            
+            rect.stretch_about_point(nb_days_left / 365, dim, corner)
+
+            toggle = not toggle
+