# Recipe 50: Draw the picture in Figure 5.17

def coolpic2():

  canvas=makeEmptyPicture(450, 450)
  addRectFilled(canvas,1,1,450,450,white) 

  for index in range(25,1,-1):
    addRect(canvas,index,index,index*3,index*4)
    addRect(canvas,100+index*4,100+index*3,index*8,index*10)

  show(canvas)
  return canvas