# Inspired by "Georgia's Spirals"

from turtle import *

bgcolor ('black')

for a_color, a_pensize, start_radius, stop_radius, radius_step in (
    ('violet', 1, 2, 1, -1),       
    ('indigo', 1, 3, 2, -1), 
    ('blue', 1, 5, 3, -1),
    ('green', 1, 8, 5, -1),
    ('yellow', 1, 13, 8, -1),
    ('orange', 1, 21, 13, -1),
    ('red', 1, 34, 21, -1),  
):
    pensize (a_pensize)
    color (a_color)
    for angle_index in range (1):
        for radius in range (start_radius, stop_radius, radius_step):
            left (30)
            circle (radius)
        right (120)
        
done ()