diff --git a/birdie.py b/birdie.py
index 3d98845..c287c64 100644
--- a/birdie.py
+++ b/birdie.py
@@ -4,18 +4,34 @@ TITLE = "Paf l'oiseau"
 WIDTH = 400
 HEIGHT = 708
 
+
+titi = Actor('bird1', (75, 350))
+titi.speed = 1
+ecart = 50
+tube_superieur = Actor ('top', (300,0))
+tube_inferieur = Actor ('bottom',(300,tube_superieur.height + ecart))
+
 def on_mouse_down():
     print('Clic souris !')
     titi.y -= 50
 
 def update():
     titi.y += titi.speed
+    tube_superieur.x -= vitesse_defilement
+    tube_inferieur.x -= vitesse_defilement*2
+    if tube_superieur.right < 0:
+        tube_superieur.left = WIDTH
+    if tube_inferieur.right < 0:
+        tube_inferieur.left = WIDTH    
 
 def draw():
     screen.blit('background', (0, 0))
     titi.draw()
+    tube_superieur.draw()
+    tube_inferieur.draw()
 
-titi = Actor('bird1', (75, 350))
-titi.speed = 1
+print(tube_superieur.width, tube_inferieur.height)
+
+vitesse_defilement = 1
 
 pgzrun.go()