Believe it or not, but the history of this style of tattooing is normally traced back to a single movie: Alien. Whether or not the Alien movies were the source of biomechanical tattoos, the imagery can't help but make one think of them. For the hardcore sci-fi fanatics, the biomechanical tattoos generally portray some combination of human and robotic parts intertwined. Tattoos that mimic ripped flesh exposing mechanical parts underneath are the most common variety, and are normally placed on muscular parts of the body like the arms or legs.