There is an Indian legend of Yashodhara, mother of Krishna, one of the major Hindu deities, opening his infant mouth because he has swallowed a clod of dirt. She pries his teeth apart and witnesses the whole universe inside him: the stars, the planets, the million suns, the whirling galaxies, the black holes. Was each of our B cells carrying a reflected cosmos—the cognate reverse of every antigen in the universe?
