diff --git a/falling_sand.py b/falling_sand.py
index 906e759..1af02eb 100644
--- a/falling_sand.py
+++ b/falling_sand.py
@@ -174,14 +174,13 @@ class FallingSand:
     def spawn_sand(self, position):
         x, y = position
 
-        for ax in range(-4, 5):
-            for ay in range(-4, 5):
-                print(ax, ay)
+        for ax in range(-8, 9):
+            for ay in range(-8, 9):
                 bx, by = position
                 bx += ax
                 by += ay
 
-                if self.matrix[bx, by] == self.sand_surface.map_rgb(self.gray):
+                if self.matrix[bx, by] == self.sand_surface.map_rgb(self.gray) and bx % 2 == 0 and by % 2 == 0:
                     self.falling_sand_particles.append(FallingSandParticle(self, (bx, by)))