Any time the door is closed with the key outside the room, the Room "resets": everything that is not an Object disappears, including people. Multiple people can enter the room at once, but they must exit the room when the Key does. When the Room resets, any Objects in the Room will return to their original position at the time of the Event. A benefit of this is that an Object enclosed within something else, such as a safe, may be retrieved by leaving it inside and resetting the room. This can also be used to distinguish real Objects from fakes, since fakes will disappear.