A control unit, method and computer program product cooperate to provide a controllable depth of display of at least a part of a graphical user interface. Moreover, the control unit includes a control circuit that controls a depth display of an icon, which may be a user-selectable icon, as part of the graphical user interface. The control circuit increases the depth of display of the icon when an object is detected as approaching the display. In this way, a user is provided with visual feedback when the user is interacting with the graphical user interface.