1. A data input device comprising: an illuminator operative to illuminate at least one engagement plane by directing light along said at least one engagement plane; a two-dimensional imaging sensor viewing said at least one engagement plane from a location outside said at least one engagement plane for sensing light from said illuminator scattered by engagement of a data entry object with said at least one engagement plane; and a data entry processor receiving an output from said two-dimensional imaging sensor and providing a data entry input to utilization circuitry.