Mere chop-logic!—you have nothing to say.

Astounding SF, Genius, P. Anderson, 1948

If they see something I missed, or if I misenforce a penalty or become confused, I encourage them to question me or point out my mistake.

HPMC supports a wide variety of shape classes, including spheres / disks, unions of spheres, convex polygons, convex spheropolygons, concave polygons, ellipsoids / ellipses, convex polyhedra, convex spheropolyhedra, spheres cut by planes, and concave polyhedra.