A consequence of the Rule of Perception: Air, which you can't see, doesn't actually exist. Some applications: * If you stop time, so that everything in the world is frozen in place except you, you can move around easily; you are not held immobile by the air molecules frozen in place around you. (Suffocating is also not a problem.) * If you can travel at Super Speed, you don't have to worry about air resistance or friction. * If you are teleporting somewhere, it's important to arrive in an empty space where you won't be intersecting any solid objects, but you don't have to worry about intersecting the air molecules that are probably swarming through your empty space.