Repeat recordings are sometimes referred to as an example of Stone tape or Water Tape theory. The theory goes that water and or stone can capture a recording of an event usually cited as a traumatic or tragic event. There is absolutely no substance in the theory no puns intended, but there is scientific proof that water is able to maintain a memory, just not in the way that the theory goes, at least not yet.

This type of apparition is non sentient , that is they are oblivious to the viewer, which in a way supports the stone tape being replayed. Another theory which also has a scientific basis of sorts is that of parallel dimensions breaking through to each other. Science has established that there should be a number of parallel universes and various numbers have been proposed.  At the moment this is as far as the theory goes, the big problem is that should one dimension touch another a rather large explosion should immediately destroy both. This is ignoring the need for a huge amount of energy to enable them to touch in the first place, so this is a very unlikely explanation when you look at the known facts.
So what are Replay or Ignorant apparitions? The first thing is that the viewer  comments that the spirit/ghost seemed completely oblivious of the human viewer. When accounts of the apparition are compared to others at the same location there are striking similarities to the descriptions of the event.

 Sometimes the conditions in which the apparitions are seen are the same, same weather, same time of year, in some cases the same day or the same date.

This particular type of apparition is not limited to the once living there are accounts of Cars, Carriages, Stage Coaches, Tractors, Trains, Planes even Buildings.