Major updates

tile.py

@@ -2,17 +2,23 @@ from turtle import *
 
 def draw_tile(size):
     "Draws one tile, which can be repeated to form a pattern."
-    color("grey")
+    draw_tile_outline(size)
+    draw_squiggle(size)
+
+def draw_tile_outline(size):
+    pencolor("#dddddd")
     square(size)
-    forward(size/2)
-    color("black")
+
+def draw_squiggle(size):
+    forward(size/4)
+    pencolor("black")
     left(90)
     quarter_arc_right(size/4)
     quarter_arc_left(size/4)
     quarter_arc_left(size/4)
     quarter_arc_right(size/4)
     left(90)
-    fly(size/2)
+    fly(size/4)
     left(90)
     fly(size)
     left(90)
@@ -25,14 +31,9 @@ def fly(distance):
 
 def square(size):
     "Draws a square of side length `size`"
-    forward(size)
-    left(90)
-    forward(size)
-    left(90)
-    forward(size)
-    left(90)
-    forward(size)
-    left(90)
+    for side in range(4):
+        forward(size)
+        left(90)
 
 def quarter_arc_right(radius):
     "Draws a quarter of an arc, turning to the right."