Message Cube
a device which is virtually unsliceable, a message cube can be keyed to the recipient's body chemistry, fingerprints, or voice. The outside of the cube is used to display the recipient's name, address, or a short message or code phrase. The cube can be hollow, used for delivering small data chips or other physical media, or it can be built around a tiny holoprojector. Cubes which contain holovids can be set for single viewing or repetition.