English: Given a convex regular dodecagon, we can extend its sides to construct another regular dodecagon.  For example, imagine there is only one polygon in the figure:  the convex dodecagon with a blue surface.  From this given dodecagon, we can construct the blue segments, by extending all the sides of the initial dodecagon.  These blue segments are the sides of a stellated regular dodecagon, called a stellation of the initial dodecagon.  This star shares its vertices with a new convex dodecagon, the surface of which is white.  By iterating the construction, we can produce an infinite number of regular dodecagons, which are alternatively convex and stellated.