Poltergeist

A poltergeist (/ˈpoʊl-tər-ˌgaɪst/), also variously known as a klopgeest, bankeånd, or räyhähenki, is a type of aetherius frequently associated with psychokinetic occurences. They are most commonly found in North and South America and eastern Europe, though they have also been reported in Australia and Japan.

Etymology
The most common name for the species is derived from the German words poltern ("to make sound" and "to rumble") and Geist ("ghost" and "spirit"). It is so named because of the clamor it creates when it throws or moves objects around.

Taxonomy
Poltergeists are the most common extant taxon of the proposed genus Nubem, meaning "cloud." It is likely that they are also one of the earliest, and most unchanged, species in the known history of aetherii, given that descriptions of encounters with them are frequent and all very similar.

Visibility
Poltergeists are always invisible. The energy makeup of a poltergeist, while not necessarily uniform, nonetheless behaves as a transparent isotropic medium when exposed to light waves.

Tangibility
Poltergeists themselves are intangible, as their energy makeup is completely electromagnetic and their motion is solely through wave propagation. However, the traditional classification of poltergeists as "intangible" is often frustrated or confused by the psychokinetic attributes that they demonstrate. This is, however, caused by a conversion of projected energy from the poltergeist from electromagnetic to kinetic energy upon entering the strong force quantum field of a targeted matter object. The energy is a projection through Intent, and not a part of the poltergeist itself; therefore, "intangible" is the literal classification of the aetherius.

Structure
The classification of a poltergeist as both invisible and intangible makes the study of its structure difficult. However, assumptions based on the behaviors of both matter and energy suggest that the poltergeist is of amorphous structure, not relegated to a specific form, size, or shape.