# Inspired by "Georgia's Spirals"

from turtle import *

bgcolor ('black')

for a_color, a_pensize, start_radius, stop_radius, radius_step in (
    ('violet', 1, 20, 10, -1),       
    ('indigo', 1, 30, 20, -2), 
    ('blue', 1, 50, 30, -3),
    ('green', 1, 80, 50, -5),
    ('yellow', 1, 130, 80, -8),
    ('orange', 1, 210, 130, -13),
    ('red', 1, 340, 210, -21),  
):
    pensize (a_pensize)
    color (a_color)
    for angle_index in range (10):
        for radius in range (start_radius, stop_radius, radius_step):
            right (120)
            circle (radius)
        right (12)
        
done ()