A method, comprising: selecting a visualization mode selected from a group consisting of an augmented reality mode, a virtual reality mode, and a blended reality mode, the blended reality mode comprising rendering of individual physical objects sensed using an environment sensing system as individual virtual physical objects ; sensing two or more individual physical objects using the environment sensing system in a first environment; projecting light toward a first display lens of a first head-mounted user display device , the light comprising a virtual object and renderings of the two or more individual physical objects ; reflecting the light using the first display lens toward a first user's eye; selectively allowing transmission of light from an outside environment directly through the first display lens in response to selecting the visualization mode using the first display lens wherein the first head-mounted user display device is configured for displaying one of a virtual object, a physical object , a virtual physical object , or any combination of virtual objects, physical objects, and transmitting the virtual object and the renderings of the two or more individual physical objects to a second head-mounted user display device in a second environment, the second head-mounted user display device projecting second light comprising the virtual object and the renderings of the two or more individual physical objects toward a second display lens of the second head-mounted user display device and reflecting the second light using the second display lens toward a second user's eye, the second head-mounted user display device operating in the augmented reality mode or the virtual reality mode and displaying at least the virtual object and the renderings of the two or more physical objects to the second user . selecting a visualization mode selected from a group consisting of an augmented reality mode, a virtual reality mode, and a blended reality mode, the blended reality mode comprising rendering of individual physical objects sensed using an environment sensing system as individual virtual physical objects ; sensing two or more individual physical objects using the environment sensing system in a first environment; projecting light toward a first display lens of a first head-mounted user display device , the light comprising a virtual object and renderings of the two or more individual physical objects ; reflecting the light using the first display lens toward a first user's eye; selectively allowing transmission of light from an outside environment directly through the first display lens in response to selecting the visualization mode using the first display lens wherein the first head-mounted user display device is configured for displaying one of a virtual object, a physical object , a virtual physical object , or any combination of virtual objects, physical objects, and transmitting the virtual object and the renderings of the two or more individual physical objects to a second head-mounted user display device in a second environment, the second head-mounted user display device projecting second light comprising the virtual object and the renderings of the two or more individual physical objects toward a second display lens of the second head-mounted user display device and reflecting the second light using the second display lens toward a second user's eye, the second head-mounted user display device operating in the augmented reality mode or the virtual reality mode and displaying at least the virtual object and the renderings of the two or more physical objects to the second user . <EOS>