import turtle

# Set up the screen
screen = turtle.Screen()
screen.bgcolor("black")
screen.title("Simple Turtle Animation")

# Create a turtle
my_turtle = turtle.Turtle()
my_turtle.shape("turtle")
my_turtle.color("white")

# Define the animation function
def animate():
    my_turtle.forward(100)
    my_turtle.left(90)
    my_turtle.forward(100)
    my_turtle.left(90)
    my_turtle.forward(100)
    my_turtle.left(90)
    my_turtle.forward(100)
    my_turtle.left(90)

# Animate the turtle
for _ in range(4):
    animate()

# Close the window when clicked
screen.exitonclick()