Express the death of calligraphy with a pen

The so-called "dead pen" in calligraphy is generally a bad pen caused by incorrect writing method or poor wrist movements.

The common manifestations are: cow head, rat tail, broom, bamboo joint, bee waist, crane knee, nail head, broken wood, firewood, sawtooth, sharp edge, hair, tail hanging, shrug, shoulder off and willow leaves.