diff --git a/app.py b/app.py
index 1312fb0..a39b866 100644
--- a/app.py
+++ b/app.py
@@ -16,7 +16,9 @@ def __init__(self,
             self.color = [random.random(), random.random(), random.random()]
         else:
             self.color = color
-        self.color_change = [1, 1, 1]
+        self.color_change = [random.choice([1, -1]),
+                random.choice([1, -1]),
+                random.choice([1, -1])]
 
         # init points
         if points is None: