diff --git a/__init__.py b/__init__.py
index 6d5915c..ae9db71 100644
--- a/__init__.py
+++ b/__init__.py
@@ -7,20 +7,6 @@ LEFT  = 1
 DOWN  = 2
 RIGHT = 3
 
-def dir_str(dir):
-    if dir == UP:
-        return 'back'
-    elif dir == LEFT:
-        return 'left'
-    elif dir == DOWN:
-        return 'front'
-    elif dir == RIGHT:
-        return 'right'
-
-def image_path(direction, step):
-    dir = os.path.dirname(__file__)
-    return f"{dir}/sprites/{dir_str(direction)}{str(step + 1)}.png"
-
 
 class Random:
     def __init__(self):
@@ -49,15 +35,24 @@ class Quox(Application):
     LEFT            = -90
     RIGHT           = 70
 
+    @staticmethod
+    def image_path(direction, step):
+        dir   = os.path.dirname(__file__)
+        bases = {UP: 'back', LEFT: 'left', DOWN: 'front', RIGHT: 'right'}
+        base  = bases[direction]
+        return f"{dir}/sprites/{base}{step}.png"
+
     def __init__(self, app_ctx):
         super().__init__(app_ctx)
-
         self.random = Random()
+
         self.choose_direction()
         self.choose_turn_delay()
+
         self.step = 0
         self.step_delay = Quox.STEP_DELAY
         self.move_delay = Quox.MOVE_DELAY
+
         self.x = -10
         self.y = -10
 
@@ -72,7 +67,7 @@ class Quox(Application):
            .fill()
 
     def image(self, ctx):
-        path = image_path(self.direction, self.step)
+        path = Quox.image_path(self.direction, self.step)
         ctx.image(path, self.x, self.y, -1, -1)
 
     @staticmethod
diff --git a/sprites/.directory b/sprites/.directory
new file mode 100644
index 0000000..5bc311e
--- /dev/null
+++ b/sprites/.directory
@@ -0,0 +1,3 @@
+[Dolphin]
+Timestamp=2023,8,16,15,52,48
+Version=4
diff --git a/sprites/back0.png b/sprites/back0.png
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diff --git a/sprites/front0.png b/sprites/front0.png
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diff --git a/sprites/left0.png b/sprites/left0.png
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index 0000000..191a0ce
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diff --git a/sprites/left1.png b/sprites/left1.png
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diff --git a/sprites/right0.png b/sprites/right0.png
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