diff --git a/examples/tiles/2_edge_wang_tiles_basic.scad b/examples/tiles/2_edge_wang_tiles_basic.scad
index 5dc6199f..1fef3230 100644
--- a/examples/tiles/2_edge_wang_tiles_basic.scad
+++ b/examples/tiles/2_edge_wang_tiles_basic.scad
@@ -124,53 +124,27 @@ module path_tile(n, width) {
 			}
 		}
 	}
-	
-	if(n == 0) {
-	    square(width, center = true);
+
+	module select_child(n) {
+		children(n);
 	}
-	else if(n == 1) {
+
+	select_child(n) {
+		square(width, center = true);
 		tile1();
-	}
-	else if(n == 2) {
-	    rotate(-90) tile1();
-	}
-	else if(n == 3) {
-	    tile3();
-	}
-	else if(n == 4) {
-	    rotate(-180) tile1();
-	}
-	else if(n == 5) {
-	    tile5();
-	}
-	else if(n == 6) {
-	    rotate(-90) tile3();
-	}
-	else if(n == 7) {
-	    tile7();
-	}
-	else if(n == 8) {
-	    rotate(90) tile1();
-	}
-	else if(n == 9) {
-	    rotate(90) tile3();
-	}
-	else if(n == 10) {
-	    rotate(90) tile5();
-	}
-	else if(n == 11) {
-	    rotate(90) tile7();
-	}
-	else if(n == 12) {
-	    rotate(-180) tile3();
-	}
-	else if(n == 13) {
-	    rotate(180) tile7();
-	}
-	else if(n == 14) {
-	    rotate(270) tile7();
-	}
-	else if(n == 15) {
-	    tile15();
+		rotate(-90) tile1();
+		tile3();
+		rotate(-180) tile1();
+		tile5();
+		rotate(-90) tile3();
+		tile7();
+		rotate(90) tile1();
+		rotate(90) tile3();
+		rotate(90) tile5();
+		rotate(90) tile7();
+		rotate(-180) tile3();
+		rotate(180) tile7();
+		rotate(270) tile7();
+		tile15();
 	}
 }
\ No newline at end of file
diff --git a/examples/tiles/random_city.scad b/examples/tiles/random_city.scad
index 912e7526..ac772a97 100644
--- a/examples/tiles/random_city.scad
+++ b/examples/tiles/random_city.scad
@@ -25,33 +25,33 @@ random_city(rows, columns, mask);
 module random_city(rows, columns, mask) {
     tile_width = 30;
 
-    module tiles() {
-        for(tile = tile_w2e(rows, columns, mask)) {
-            x = tile[0];
-            y = tile[1];
-            i = tile[2];
-            translate([x, y] * tile_width)
-                children(i);
-        }
-    }
+	module select_child(n) {
+		children(n);
+	}
 
-    tiles() {
-        tile00();
-        tile01();
-        tile02();
-        tile03();
-        tile04();
-        tile05();
-        tile06();
-        tile07();
-        tile08();
-        tile09();
-        tile10();
-        tile11();
-        tile12();
-        tile13();
-        tile14();
-        tile15();
+    for(tile = tile_w2e(rows, columns, mask)) {
+        x = tile[0];
+        y = tile[1];
+        i = tile[2];
+        translate([x, y] * tile_width)
+        select_child(i) {
+            tile00();
+            tile01();
+            tile02();
+            tile03();
+            tile04();
+            tile05();
+            tile06();
+            tile07();
+            tile08();
+            tile09();
+            tile10();
+            tile11();
+            tile12();
+            tile13();
+            tile14();
+            tile15();
+        }
     }
 
     // tiles, quick and dirty code
diff --git a/examples/tiles/tube_box.scad b/examples/tiles/tube_box.scad
index 8fbfb528..052e2381 100644
--- a/examples/tiles/tube_box.scad
+++ b/examples/tiles/tube_box.scad
@@ -13,7 +13,7 @@ module tube_box(rows, columns, tile_width) {
 	quarter_w = tile_width / 4;
 	eighth_w = tile_width / 8;
 	
-    translate([eighth_w, eighth_w, -eighth_w] + [tile_width, tile_width] / 2)
+    translate([eighth_w, eighth_w, eighth_w] + [tile_width, tile_width, 0] / 2)
 		for(tile = tile_w2e(rows, columns)) {
 			x = tile[0];
 			y = tile[1];
@@ -30,6 +30,26 @@ module tube_tile(n, width) {
     half_w = width / 2;
 	quarter_w = width / 4;
 	sixteenth_w = width / 16;
+
+	module tile0() {
+		difference() {
+			union() {
+				linear_extrude(width / 2)
+				circle(quarter_w);
+				
+				translate([0, 0, half_w])
+				linear_extrude(sixteenth_w, center = true)
+					circle(quarter_w * 1.2);
+
+				linear_extrude(sixteenth_w, center = true)
+					circle(quarter_w * 1.2);
+			}
+
+			linear_extrude(width)
+				circle(quarter_w - quarter_w * 0.2);
+		}
+	}
+		
 	module tile1() {
 	    translate([0, half_w])
 	    rotate([90, 0, -90]) {
@@ -91,53 +111,27 @@ module tube_tile(n, width) {
 		rotate(90)
 		tile5();
 	}
-	
-	if(n == 0) {
-	    // no tube
-	}
-	else if(n == 1) {
+
+	module select_child(n) {
+		children(n);
+	}	
+
+	select_child(n) {
+		tile0();
 		tile1();
-	}
-	else if(n == 2) {
-	    rotate(-90) tile1();
-	}
-	else if(n == 3) {
-	    tile3();
-	}
-	else if(n == 4) {
-	    rotate(-180) tile1();
-	}
-	else if(n == 5) {
-	    tile5();
-	}
-	else if(n == 6) {
-	    rotate(-90) tile3();
-	}
-	else if(n == 7) {
-	    tile7();
-	}
-	else if(n == 8) {
-	    rotate(90) tile1();
-	}
-	else if(n == 9) {
-	    rotate(90) tile3();
-	}
-	else if(n == 10) {
-	    rotate(90) tile5();
-	}
-	else if(n == 11) {
-	    rotate(90) tile7();
-	}
-	else if(n == 12) {
-	    rotate(-180) tile3();
-	}
-	else if(n == 13) {
-	    rotate(180) tile7();
-	}
-	else if(n == 14) {
-	    rotate(270) tile7();
-	}
-	else if(n == 15) {
-	    tile15();
+		rotate(-90) tile1();
+		tile3();
+		rotate(-180) tile1();
+		tile5();
+		rotate(-90) tile3();
+		tile7();
+		rotate(90) tile1();
+		rotate(90) tile3();
+		rotate(90) tile5();
+		rotate(90) tile7();
+		rotate(-180) tile3();
+		rotate(180) tile7();
+		rotate(270) tile7();
+		tile15();
 	}
 }
\ No newline at end of file