1. A machine implemented method for use in at least one of virtual reality and augmented reality, the method comprising: defining, in a processor of a head mounted display unit, a positional data space with respect to a display of the head mounted display unit, wherein the positional data space comprises at least two dimensions and substantially coincides with at least a region of real space visualized through the display, wherein the display of the head mounted display unit is configured to be positioned in front of a user's eyes; establishing, in said processor, a field of view visible to the user via the display, wherein the field of view is in said positional data space; defining, with the processor, a first domain of said positional data space with respect to the display, wherein the first domain includes the field of view of the user; defining, with the processor, a second domain of said positional data space relative to the display and said field of view, said second domain being substantially distinct from said first domain and substantially excluding said field of view; defining, via the processor, a bridge in said positional data space with respect to the display and said field of view, said bridge comprising a spatial boundary between said first and second domains and contiguous with at least a portion of said first domain and at least a portion of said second domain, wherein the bridge allows motion of an entity between said first and second domains, and wherein the entity is at least one of a virtual reality entity and an augmented reality entity; detecting, with a sensor of the head mounted display unit, whether a physical effector moves across the bridge while engaged with the entity, wherein the physical effector is provided by the user, and wherein if when said entity is in said first domain, if the sensor detects the physical effector moving across said bridge while engaged with said entity, moving, via the processor, said entity across said bridge into said second domain; if when said entity is in said first domain, if the sensor does not detect the physical effector and said entity moves across said bridge, moving, via the processor, said entity across said bridge but within said first domain; if when said entity is in said second domain, if the sensor detects the physical effector moving across said bridge while engaged with said entity, moving, via the processor, said entity into said first domain; if when said entity is in said second domain, if the sensor does not detect the physical effector moving across the bridge and the entity is not engaged with said physical effector, not moving, via the processor, said entity into said first domain; and based on data detected by the sensor, visibly outputting said entity to the display when said entity is in said first domain, but not visibly outputting said entity to said display when said entity is in said second domain.