Rectangles: (5 entries)
  0: Rectangle: x1=0, y1=0, x2=0, y2=0
  1: Rectangle: x1=20, y1=20, x2=180, y2=180
  2: Rectangle: x1=20, y1=20, x2=240, y2=240
  3: Rectangle: x1=20, y1=20, x2=300, y2=300
  4: Rectangle: x1=20, y1=20, x2=340, y2=340