import turtle
t = turtle.Turtle()
t.speed(7) # 1:slowest, 3:slow, 5:normal, 10:fast, 0:fastest


golden = (1 + 5 ** 0.5) / 2

share = 360 / golden

for i in range(128):
    orientation = share * i % 360
    c = 256 - i * 2
    t.color(c, c, c)
    t.seth(orientation)
    l = 100 - i / 2
    t.forward(l)
    t.seth(orientation + 180)
    t.forward(l)