Isipiliyoni semidlalo eyenziwe ngumuntu sihluke kakhulu kunemvelo. Ukuphuma nokushona kwelanga, ubusika nehlobo, umoya, isithwathwa, imvula neqhwa, izimbali, izinyoni, izinambuzane nezinhlanzi. Akukho lutho olungcono kunokuba usondelene nemvelo, ngoba kuningi okuthakazelisayo nokungakholeki.