import turtle

t = turtle.Turtle()
s = turtle.Screen()

s.bgcolor('black')
t.speed(0)

col = ["yellow", "red", "pink", "cyan", "light green", "blue"]

for i in range(150):
    t.pencolor(col[i % 6])
    t.circle(190 - i / 2, 90)
    t.lt(90)
    t.circle(190 - i / 3, 90)
    t.lt(60)

s.exitonclick()