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.