Trippier Turtle

import turtle

t = turtle.Turtle()
t.speed(0)

def main():
    factor = 1.005
    radius = 1.0
    t.color("#ff0000")
    t.left(180)
    t.forward(radius)
    t.left(180)
    for i in range(100):
        for color in ["#ff0000", "#ff4000", "#ff8000", "#ffc000", "#ffff00", "#c0ff00", "#80ff00", "#44ff00", "#00ff00", "#00ff40", "#00ff80", "#00ffc0", "#00ffff", "#00c0ff", "#0080ff", "#0040ff", "#0000ff", "#4000ff", "#8000ff", "#c000ff", "#ff00ff", "#ff00c0", "#ff0080", "#ff0040"]:
            t.color(color)
            t.forward(2 * radius)
            t.right(181)
            radius *= factor
main()