Tattoo

S1, E5: In a clannish world, tattoos announce where you belong. They declare that the bearer is either one of "us" or one of "them" – and "they" are almost always taboo. Explore the realm of headhunters where tattoos were once a matter of life and death. Witness a bloody rite of passage in Africa as a boy goes under the knife to earn his literal stripes as a man. Tattoos serve as totems to human creativity, as well as testimony to our darker impulses. With a tattoo, we can literally draw the lines that divide the accepted from the taboo.