A cruel way of making a mankurt, a captive man that forgets everything but basic activities and thus becomes an ideal slave of jurchen masters. A fresh raw camel hide would be put as a cap on the thoroughly shaven head of a captive. The slave with his hands tied and with a large wooden stock around his neck preventing him from reaching his head would be left in desert for several days. Once the hide would start drying it would shrink and bind to the head, thus making a hoop and "squeezing" all sanity out of the man.