Isibani senkungu esingaphambili siyisibani semoto esenzelwe ukukhanya ngomsebe womugqa. Umsebe uvame ukuklanywa ukuba nendawo ebukhali yokunqamula phezulu, kanti ukukhanya kwangempela kuvame ukufakwa phansi futhi kuqondiswe phansi nge-Acute Engela. Ngenxa yalokho, izibani zenkungu zithambekela emgwaqweni, zithumela ukukhanya emgwaqweni futhi zikhanyise umgwaqo esikhundleni sengqimba yenkungu. Indawo kanye nokuqondiswa kwezibani zenkungu kungaqhathaniswa futhi kuqhathaniswe nezibani zenkungu eziphezulu nezikhanyayo eziphansi ukuze kwembulwe ukuthi la madivayisi abonakala efana ahluke kangakanani. Izibani zenkungu eziphezulu neziphansi zihlose ama-engeli angajulile, okuzivumela ukuthi zikhanyise umgwaqo kude kakhulu phambi kwemoto. Ngokuphambene nalokho, ama-engeli abukhali asetshenziswa izibani zenkungu asho ukuthi zikhanyisa umhlaba ngqo phambi kwemoto. Lokhu kwenzelwa ukuqinisekisa ububanzi besithombe sangaphambili.
