Qiu Zi: Shaped like a jujube pit, mostly oval, unable to stand upright, with loose lines, inconspicuous flanks and obvious side edges.

Lantern: spiny, very close to spherical, with dense lines and no protruding sides. Good lanterns look like real lanterns.

Chicken heart: it is named after its large and smooth particles and very similar shapes.

Official hat: the flank is wide, like the official hat of the Tang Dynasty.

Lion head: majestic, with many twisted lines.

Opposite sex: triangular and quadrilateral duckbill and so on.

Degree of perfection

Blunt tip: the tip at the top is round, so it won't prick your hand without grinding.

Short pile: refers to the transverse diameter is greater than the longitudinal diameter.

Grinding disc: refers to the overall shape of a plane circle.

Alien: triangle, quadrilateral, double stick and so on.

Dense texture: the texture is tight, and there are no large concave lines.