Extra is a word used to describe a unexplainable apperation, face or orb that was not there before the picture was taking! Which sometimes full apperations or faces can be seen that of a reletive or friend who have passed away! But there has also been images capture of a reletive or friend who have not passed away but are living miles away. It is unexplainable why that is for those who have captured an image of their reletive or friend who are still alive, but yet they were not there! In the early days of photographs being taken, many of those strange images were faked, but there are a small number of examples that defy explanations even today!