clear()
setBackground(blue)
setPenColor(magenta)
setPenThickness(10)
forward(20)
setPenThickness(14)
forward(20)
setPenThickness(19.6)
forward(20)
setPenThickness(27.4)
forward(20)
setPenThickness(38.4)
forward(20)
setPenThickness(53.6)
forward(20)
invisible()