Maurer roses
What is a Maurer rose?
$$r=\cos(dt),\qquad x=\cos(dt)\cos t,\qquad y=\cos(dt)\sin t.$$
GeoGebra applet
$$x=\cos(dt)\cos(t),\qquad y=\cos(dt)\sin(t).$$
How is it constructed?
$$t_k=k\alpha,\qquad k=0,1,2,\ldots,p.$$
Key idea:
johzu