A user interface device having a user input component, a mechanical metamaterial region, one or more actuators, and a control unit is presented. The mechanical metamaterial region is located over the user input component. The one or more actuators are coupled to the mechanical metamaterial region, which has an internal structure that is mechanically alterable with the one or more actuators, and has a mechanical property that changes in response to the alteration of the internal structure by the one or more actuators. The control unit is in communication with the one or more actuators, and is configured to determine whether the user input component is to be hidden from tactile perception, and to activate the one or more actuators to mechanically alter the internal structure of the mechanical metamaterial region.