1. An input assembly comprising: a graphic display layer providing, or configured to provide a plurality of function icons; a masking layer including a plurality of function icon windows for displaying functions icons associated with a particular application, each of the displayed function icons corresponding to a function of the particular application; and an input device including a plurality of input device sections each configured for receiving a gesture input; wherein the graphic display layer is moveable relative to the masking layer such that, based on the relative positioning between the graphic display layer and the masking layer, function icons associated with a particular application are displayed through the function icon windows and the other function icons are at least obscured by the masking layer; and wherein the receiving of the gesture input by a one of the plurality of input device sections which corresponds to a one of the displayed function icons invokes the function corresponding to the one of the displayed function icons.