Manual control interface including: a movable part, a photo-detector, a movable holographic element including a first series of holograms forming coding motifs of the selection position of the movable part, characterized by the fact that the movable holographic element includes a second series of holograms forming figurative motifs representing the functions of the apparatus, the position of the movable holographic element relative to the support determining the figurative motif which is illuminated by a suitable light beam, so as to project the figurative motif corresponding to the selected function towards a display zone visible to the user.