The sound of a cell-phone vibrating breaks the silence. It's nestled atop a hard tabletop, the vibrations causing a soft, yet noticeable, buzz that echoes subtly across the room. It's receiving a call, or perhaps a text, the vibrations a rhythmic call to attention. The noise ceases for a moment, only to start up again, persistent, as if the device itself is urging its owner to acknowledge the incoming communication.