ABSTRACT
Figure 17.1 shows a polygon. It is the outline of a shape, drawn with straight line segments. Since such shapes are all a printer or plotter
polygons. If we add an “eye” to the bird-shaped polygon from Figure 17.1, and if we apply a sequence of rotations and translations to it, then we arrive at Figure 17.2. It turns out copies of our special bird polygon can cover the whole plane! This technique is also present in the Escher illustration in Figure 6.8.
