from turtle import *
tracer(0)
r = 60
for i in range(15):
    for j in range(3):
        fd(3*r)
        rt(90)
    lt(180)
update()
up()
for x in range(-20, 20):
    for y in range(-20, 20):
        goto(x*r, y*r)
        dot(5, "blue")
exitonclick()