Hexagon Spiro graph

 

from turtle import *

speed(0)
bgcolor("black")

colors = ["pink" , "purple" , "pink" , "purple" , "pink" , "purple"]

for i in range(3600):
    pencolor(colors[i%6]) # 6
    width(i / 250 + 1)
    forward(i)
    left(59)

hideturtle()