Ipi is the younger of the two hero-brothers, born from Ngutapa's left knee, and stands throughout Tikuna narrative as the emblem of disorder against his brother Yoi's ordering wisdom. Rash, disobedient and given to transgression, he seduced the woman bound to Yoi and, in another strand of the tradition, lay with a sister, acts through which the original human immortality is said to have begun to decay. Set by Yoi to grate huito as punishment, he grated his own flesh; the scrapings thrown into the water became the fish from which the Tikuna and neighbouring peoples were drawn. Because Tikuna girls are painted black with huito at their puberty seclusion, that rite is remembered as a commemoration of Ipi's self-grating in the first times. In the separation of the brothers Ipi was tricked into departing westward while Yoi went east, a parting that fixed the moiety division of Tikuna society.