This exercise exemplifies an age gradient.
(Jo) At one side of the room, begin in a fetal position as if the head and the tail were desired to be together. There is nowhere to go, nowhere to be.
(Ha) Something extraordinarily subtle provokes a break from this position into that of a newborn baby on its belly. Gradually begin crawling on the belly. Crawl till you reach a walking baby followed by walking toddler, teenager, adult, and old age. Upon old age the head is attracted to the tail.