diff --git a/flatland/utils/graphics_pil.py b/flatland/utils/graphics_pil.py
index c5af55fa607da6dbccc12c0bb9a00624acf5e969..31fa07f0f69ba50695b83c9ded9e6d227a227240 100644
--- a/flatland/utils/graphics_pil.py
+++ b/flatland/utils/graphics_pil.py
@@ -434,7 +434,7 @@ class PILSVG(PILGL):
                             pilTrack = self.dScenery[0]
                         else:
                             pilTrack = self.dBuildings[a]
-                    elif self.background_grid[col][row] > 5 or ((col + row + col * row) % 10 > 7):
+                    elif (self.background_grid[col][row] > 5) or ((col**3 + row**2 + col * row) % 10 == 0):
                         a = int(self.background_grid[col][row]) - 5
                         a = a % len(self.dScenery)
                         if (col + row + col * row) % 10 > 2: