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A poltergeist (ポルターガイスト or 騒霊, sourei) is a paranormal phenomenon where objects appear to have moved or been thrown without anything touching them. In believes, they may be ghosts or spirits controlling the movement, where as science is unable to explain such energy due to the cases been widely rare.
Poltergeists in Touhou
In the Touhou Project, poltergeist are very similar to a Phantom, and is often seen announcing its presence by introducing disorder. They are described as essentially being phantoms that are able to make noise, hence the name sourei (noise spirit). They are able to remotely manipulate objects. They can also manifest themselves visibly, audibly and solidly to the material world (it is assumed that not all ghost-like beings have such an ability).
The noises that poltergeists make are actually the phantoms of musical notes, rather than physical ones. Because of this, spirits, which don't have a body, or physical ears to hear with, can also "enjoy" music made by poltergeists.
Poltergeists seem to have a talent for discovering and causing the kind of interference that will raise the greatest commotion in any sane situation. Speculatively speaking, their talent with interference potential may be what allowed the Prismriver sisters to become famous as the Phantom Ensemble. They make music that strikes all the right nerves in the audience.
Although ghosts and poltergeists are usually thought of as same species, in actuality they are not, according to ZUN. This is probably because poltergeists in Touhou (the Prismriver Sisters in particular) aren't spirits of the dead, but constructs based on Layla Prismriver's power.
Poltergeists have no life span making them immortal in the sense that they won't naturally die from old age.
Characters under this Bestiary
- Wikipedia entry for Poltergeists
- Wikipedia entry for simulated consciousness
- Wikipedia entry for subtle body