Vignettes of analytic case material are presented to illustrate and corroborate the author's thesis that in the genesis of the symbol three, which connotes the penis and testicles, visceral and kinesthetic sensations developing at the time of sexual excitement are of unique importance in the development of body representations. Further, these sensations are then projected to the outside and along with visual sensations, cultural and intellectual influences (the development of intelligence and capacity for counting), aid in the formations of the final gestalt of the symbol three.