Create a video about occlusion in augmented reality technology. The video is for Deaf and Hard-of-Hearing students. Use the following scripts: Occlusion refers to what happens when an image or object is blocked by another. Move your hand in front of your face like this. You've just occluded the computer screen with your hand. However imagine if you moved your hand in front of your face and the screen was still visible. You'd probably get a little concerned. AR objects have to play by the rules of occlusion if we want them to seem real. This means that AR hardware has to not only understand where the object is in the room, but also its relative distance from the user compared with any other object, physical or digital. Occlusion means hiding virtual objects behind other virtual objects and ones in the real world, say you move behind a wall while using AR. If you still see the AR objects, it will break your sense of immersion, that sense of AR objects actually being in the real world in the app seamlessly. Occlusion requires constant recalibration as users can move in any direction at any given moment, which is why it's one of the trickiest aspects of building successful AR content. We'll talk later about the ways that this is currently a technical constraint in mobile AR that developers need to consider in their apps just like a real world object.