1. A method implemented by a head-mountable device comprising: receiving, by the head-mountable computing device, input data that is indicative of head position; providing, by the head-mountable computing device, a user-interface that comprises a content region containing a set of selectable content objects that are horizontally arranged, wherein the content region is located at a fixed height within the user-interface; defining, by the head-mountable computing device, a view region that is movable within the user-interface, wherein the view region is smaller than the user-interface; associating, by the head-mountable computing device, a forward-looking head position with a first location of the view region within the user-interface, wherein the fixed height of the content region is such that at least a portion of the content region is located above the view region, when the view region is at the first location associated with forward-looking head position; based on head movement data, moving the view region within the user-interface, wherein the head movement data is determined based on the input data that is indicative of head position; as the view region moves within the user-interface, displaying a portion of the user-interface corresponding to the view region in the see-through display; determining a first user-context associated with the head-mountable device; and dynamically changing the set of selectable content objects contained in the content region based on the determined first user-context.
1. A method implemented by a head-mountable device comprising: receiving, by the head-mountable computing device, input data that is indicative of head position; providing, by the head-mountable computing device, a user-interface that comprises a content region containing a set of selectable content objects that are horizontally arranged, wherein the content region is located at a fixed height within the user-interface; defining, by the head-mountable computing device, a view region that is movable within the user-interface, wherein the view region is smaller than the user-interface; associating, by the head-mountable computing device, a forward-looking head position with a first location of the view region within the user-interface, wherein the fixed height of the content region is such that at least a portion of the content region is located above the view region, when the view region is at the first location associated with forward-looking head position; based on head movement data, moving the view region within the user-interface, wherein the head movement data is determined based on the input data that is indicative of head position; as the view region moves within the user-interface, displaying a portion of the user-interface corresponding to the view region in the see-through display; determining a first user-context associated with the head-mountable device; and dynamically changing the set of selectable content objects contained in the content region based on the determined first user-context. 8. The method of claim 1 , wherein dynamically changing the set of selectable content objects contained in the content region comprises (i) identifying at least one selectable content object that is contained in the content region and is no longer associated with a current user-context; and (ii) removing, from the set of selectable content objects contained in the content region, the identified at least one selectable content object.