Not every ghost is human. There are many examples of phantom dogs, cars and ships. In some cases, a ghost is summoned or created by a person’s will. However, summoned ‘ghosts’ tend not to be human in origin at all. They’re demons or an extradimensional being. These hauntings tend to be more violent than a traditional ghosts (see post on residual and intelligent hauntings). I’ll cover these types of hauntings in a later post.