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diff --git a/Demo/turtle/tdemo_chaos.py b/Demo/turtle/tdemo_chaos.py
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+# Datei: chaosplotter.py
+# Autor: Gregor Lingl
+# Datum: 31. 5. 2008
+
+# Ein einfaches Programm zur Demonstration von "chaotischem Verhalten".
+
+from tkinter.turtle import *
+
+def f(x):
+    return 3.9*x*(1-x)
+
+def g(x):
+    return 3.9*(x-x**2)
+
+def h(x):
+    return 3.9*x-3.9*x*x
+
+def coosys():
+    penup()
+    goto(-1,0)
+    pendown()
+    goto(n+1,0)
+    penup()
+    goto(0, -0.1)
+    pendown()
+    goto(-0.1, 1.1)
+
+def plot(fun, start, farbe):
+    x = start
+    pencolor(farbe)
+    penup()
+    goto(0, x)
+    pendown()
+    dot(5)
+    for i in range(n):
+        x=fun(x)
+        goto(i+1,x)
+        dot(5)
+
+def main():
+    global n
+    n = 80
+    ox=-250.0
+    oy=-150.0
+    ex= -2.0*ox / n
+    ey=300.0
+
+    reset()
+    setworldcoordinates(-1.0,-0.1, n+1, 1.1)
+    speed(0)
+    hideturtle()
+    coosys()
+    plot(f, 0.35, "blue")
+    plot(g, 0.35, "green")
+    plot(h, 0.35, "red")
+    for s in range(100):
+        setworldcoordinates(0.5*s,-0.1, n+1, 1.1)
+
+    return "Done!"
+
+if __name__ == "__main__":
+    main()
+    mainloop()