import turtle
import math

def xt (t):
   return 16* math.sin(t) **3

def yt (t):
   return 13 * math.cos(t) - 5 * \
math.cos(2 * t) - 2 * \
math.cos(3 * t) - \
math.cos(4 * t)


t=turtle.Turtle()
t.speed(999)
turtle.color (0, 0, 0)
turtle.Screen().bgcolor (0, 0, 0)
for i in range (2550):
    t.goto((xt (i) * 20, yt (i) * 20))
    t.pencolor () % 255, i % 255, (255 + i) / 2 % 255
    t.goto (0, 0)
t.hideturtle()
turtle.update()
turtle.mainloop()