#------------------------------------------------------------------------------
#  TurtleLoop4.py
#------------------------------------------------------------------------------

import turtle

wn = turtle.Screen()
wn.bgcolor("lightgreen")

tess = turtle.Turtle()
tess.shape("turtle")        # actually looks like a turtle now
tess.color("blue")

tess.penup()                # don't draw
step = 20
for i in range(30):
   tess.stamp()             # Leave an impression instead
   step += 3                # Increase the step size on every iteration
   tess.forward(step)       # take a step
   tess.left(24)            # then turn

wn.mainloop()