diff --git a/examples/stereographic_square_maze.scad b/examples/stereographic_square_maze.scad
index f3c9c6c1..13786cf1 100644
--- a/examples/stereographic_square_maze.scad
+++ b/examples/stereographic_square_maze.scad
@@ -17,42 +17,9 @@ module stereographic_projection_maze2(maze_rows, block_width, wall_thickness, fn
     ); 
 
     length = block_width * maze_rows + wall_thickness;
-
-    module draw_block(wall_type, block_width, wall_thickness) {
-        if(wall_type == UPPER_WALL || wall_type == UPPER_RIGHT_WALL) {
-            // draw a upper wall
-            line2d(
-                [0, block_width], [block_width, block_width], wall_thickness
-            ); 
-        }
-        
-        if(wall_type == RIGHT_WALL || wall_type == UPPER_RIGHT_WALL) {
-            // draw a right wall
-            line2d(
-                [block_width, block_width], [block_width, 0], wall_thickness
-            ); 
-        }
-    }
-
-    module draw_maze(rows, columns, blocks, block_width, wall_thickness) {
-        for(block = blocks) {
-            // move a block to a right position.
-            translate([get_x(block) - 1, get_y(block) - 1] * block_width) 
-                draw_block(
-                    get_wall_type(block), 
-                    block_width, 
-                    wall_thickness
-                );
-        }
-
-        // the lowermost wall
-        line2d([0, 0], [block_width * columns, 0], wall_thickness);
-        // the leftmost wall
-        line2d([0, 0], [0, block_width * rows], wall_thickness);
-    } 
     
     module maze() {
-        translate([-block_width * maze_rows / 2, -block_width * maze_rows / 2, 0]) union() {
+        translate([-block_width * maze_rows / 2, -block_width * maze_rows / 2, 0]) 
             draw_maze(
                 maze_rows, 
                 maze_rows, 
@@ -60,14 +27,15 @@ module stereographic_projection_maze2(maze_rows, block_width, wall_thickness, fn
                 block_width, 
                 wall_thickness
             );
-        }
     }
     
     stereographic_extrude(shadow_side_leng = length, $fn = fn)
         maze();
     
     if(shadow == "YES") {
-        color("black") linear_extrude(wall_height) maze();
+        color("black") 
+            linear_extrude(wall_height) 
+                maze();
     }
 }