Using the new Visual Inertial Odometry (VIO) to track the world. It's far advanced compared to the original AR method of relying on an object as the marker. VIO uses the camera sensor data to see how the object moves in the room. Oh, and did I mention you don't need a physical object marker!! ARKit can analyze the scene and find horizontal planes in the room. As you can tell my dog Indy is very happy to be the object reference for my test. As long as he doesn't have to share his food with that fire breather.