A system and method for using specially printed paper and a handheld device to
supplement, or replace, large displays and user interfaces commonly required for
efficient use of computing devices. The paper is encoded with location information
and a message. The message is distributed redundantly across the page, may be arbitrarily
large, and may contain security information. In one embodiment, the device uses
a single sensor to read the encoded message and location information, and to measure
the relative motion of the device. After scanning the specially printed paper,
a user may then raise the device, place it on any convenient flat surface, and
continue to slide, exploring areas outside of the printed copy.
