an interaction / input device for use in systems utilizing infrared video - based trackers is provided . the interaction / input device is employed by placing markers , e . g ., small retroreflective disks , in a predetermined configuration on a planar surface to simulate physical buttons . once in view of the infrared tracker , the system will recognize the predetermined configuration as the input device which can then be physically manipulated by the user . the user will put their fingers on one of these markers or disks , and in turn , the infrared video - based tracker will recognize this action and process it accordingly . optionally , an augmented reality system employing the input device of the present invention can also augment simulated menus in the user &# 39 ; s view , via a head - mounted display , giving the user the necessary feedback for interaction . by exploiting conventional tracking technology , the interaction / input device can be implemented with minimal additional hardware and minimal additional processing required by the system .