diff --git a/examples/photo_sphere.scad b/examples/photo_sphere.scad
index c8f9b2d1..4b81cd8c 100644
--- a/examples/photo_sphere.scad
+++ b/examples/photo_sphere.scad
@@ -1,6 +1,7 @@
 use <pixel/px_gray.scad>;
 use <experimental/pt_to_sphere.scad>;
 
+photo_size = [100, 100];
 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], 
@@ -109,14 +110,14 @@ dots = px_gray(levels, center = true, normalize = true);
 
 color("white")
     for(dot = dots) {   
-        translate(pt_to_sphere([100, 100], dot[0] + [50, 50], 50, [180, 180])) 
+        translate(pt_to_sphere(photo_size, dot[0] + [50, 50], 50, [180, 180])) 
             square(dot[1] * 2.5);
     }
     
 rotate([180, 0, 0])
 color("white")
     for(dot = dots) {   
-        translate(pt_to_sphere([100, 100], dot[0] + [50, 50], 50, [180, 180])) 
+        translate(pt_to_sphere(photo_size, dot[0] + [50, 50], 50, [180, 180])) 
             square(dot[1] * 2.5);
     }