diff --git a/__pycache__/tile.cpython-310.pyc b/__pycache__/tile.cpython-310.pyc
new file mode 100644
index 0000000..d6e1e65
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diff --git a/__pycache__/tile_grid.cpython-310.pyc b/__pycache__/tile_grid.cpython-310.pyc
new file mode 100644
index 0000000..27857ab
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diff --git a/tile.py b/tile.py
index 697cf8e..5271194 100644
--- a/tile.py
+++ b/tile.py
@@ -1,27 +1,26 @@
 from turtle import *
+import math
 
 def draw_tile(size):
     "Draws one tile, which can be repeated to form a pattern."
     draw_tile_outline(size)
-    draw_squiggle(size)
+    draw_design(size)
 
 def draw_tile_outline(size):
     pencolor("#dddddd")
     square(size)
 
-def draw_squiggle(size):
-    forward(size/4)
+def draw_design(size):
+    forward(size/2)
     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/4)
-    left(90)
-    fly(size)
-    left(90)
+    fillcolor("black")
+    left(45)
+    begin_fill()
+    square(math.sqrt(2 * ((size / 2) ** 2)))
+    end_fill()
+    left(135)
+    fly(size/2)
+    left(180)
 
 def fly(distance):
     "Moves without drawing."
diff --git a/tile_grid.py b/tile_grid.py
index 72a0f43..f2cfab6 100644
--- a/tile_grid.py
+++ b/tile_grid.py
@@ -10,7 +10,12 @@ from tile import fly
 def draw_tile_grid(width, height, tile_size, tile_function):
     """Draws a (width x height) grid, with tile_function drawn on each tile.
 
-    (Your explanation here.)
+    The inner-loop draws each tile to fill out a row, after which the turtle goes
+        back to the beginning of the row and then moves up to begin filling out the
+        next row (the outer-loop controls how many times to shift up in the overall
+        grid), continuing this build-row-then-shift process until the complete
+        grid has been created. The turtle finishes the process back in the lower-left
+        corner of the grid that it created.
     """
     for y in range(height):
         for x in range(width):