diff --git a/examples/voronoi/voronoi_crystallization.scad b/examples/voronoi/voronoi_crystallization.scad
index 156fe01f..69b7dcbe 100644
--- a/examples/voronoi/voronoi_crystallization.scad
+++ b/examples/voronoi/voronoi_crystallization.scad
@@ -1,8 +1,9 @@
 use <experimental/voronoi_square_cells.scad>;
 
 grid_w = 5;
-spacing = 0;
+spacing = 0.2;
 bottom = "YES"; // [YES, NO]
+invert = "YES"; // [YES, NO]
 levels = [
     [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
     [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
@@ -114,14 +115,13 @@ for(cell = cells) {
     if(!is_undef(level)) {
         h = level / 255;
         color([h, h, h])
-        linear_extrude(h * 10 + 1)
+        linear_extrude((invert == "YES" ? 10 - h * 10 : h * 10) + 2)
         offset(-spacing)
             polygon(cell[1]);
     }
 }
 
 if(bottom == "YES") {
-    color("black")
     linear_extrude(1)
     for(cell = cells) {
         level = levels[size[1] - cell[0][1]][cell[0][0]];