Create a beautiful spiral triangle in Python

import turtle


def drawSpiral(how_far, how_much):
    if how_far > 0:
        t.forward(how_far)
        t.right(how_much)
        drawSpiral(how_far-5, how_much)


turtle.Screen().bgcolor("black")
t = turtle.Turtle()
t.reset()
t.pencolor("green")
t.pen(speed=10)
turtle.delay(10)
lenght = 500
turn_by = 121
t.penup()
t.setpos(-lenght/2, lenght/2)
t.pendown()

drawSpiral(lenght, turn_by)