1. An input device comprising: a flexible hinge having an axis, a connection portion, and communication contacts, the connection portion configured to form a physical coupling to a side of a computing device sufficient to secure the input device to the computing device using a plurality of magnetic coupling devices spaced along the axis that do not support a communicative coupling with the computing device, the communication contacts spaced along the axis and configured to form a communicative coupling between the computing device and the input device; and an input portion having a writing surface configured to perform a change in optical states that is viewable by the user, the change in the optical states performable without use of electronic computation, the writing surface comprising a protective surface, one or more sensors, and a display state change material disposed directly between the protective surface and the one or more sensors.