diff --git a/birdie.py b/birdie.py
index 3d98845..e615e96 100644
--- a/birdie.py
+++ b/birdie.py
@@ -9,13 +9,20 @@ def on_mouse_down():
     titi.y -= 50
 
 def update():
-    titi.y += titi.speed
+    titi.x += titi.speed
 
 def draw():
     screen.blit('background', (0, 0))
     titi.draw()
+    tube_sup.draw()
+    tube_inf.draw()
 
 titi = Actor('bird1', (75, 350))
+
+
 titi.speed = 1
+ecart = 140
+tube_sup = Actor ('top',(300,0))
+tube_inf = Actor ('bottom',(300,tube_sup.height + ecart))
 
 pgzrun.go()