l = 3
ints = 13

def setup():
  size(700, 600)
  background(0, 0, 255)
  translate(150, 100)
  stroke(255)
  turn_left(l, ints)
  turn_right(l, ints)

def turn_right(l, ints):
    if ints == 0:
        line(0, 0, 0, -l)
        translate(0, -l)
    else:
        turn_left(l, ints - 1)
        rotate(radians(90))
        turn_right(l, ints - 1)

def turn_left(l, ints):
    if ints == 0:
        line(0, 0, 0, -l)
        translate(0, -l)
    else:
        turn_left(l, ints - 1)
        rotate(radians(-90))
        turn_right(l, ints - 1)