A user interface for an audio/visual device incorporates a touch sensor having multiple adjacently positioned control surfaces defined thereon by a processing device in which adjacent ones of the control surfaces share boundaries by which a user may move a tip of a digit from one of the control surfaces directly to an adjacent one of the control surfaces by moving that tip across a boundary shared between them, and in which the surface area of whichever one of the control surfaces a user's finger overlies at a given moment is expanded in size to increase the distance by which the user must move that tip to reposition that tip from overlying that one of the control surfaces to overlying an adjacent one, and is reduced in size to a size corresponding to an absolute mapping when a person does so move that tip.