images

A mental image
exists in an individual's mind: something one remembers or imagines.
The subject of an image need not be real; it may be an abstract
concept, such as a graph, function, or "imaginary" entity. For example, Sigmund Freud
claimed to have dreamt purely in aural-images of dialogues. The
development of synthetic acoustic technologies and the creation of sound art
have led to a consideration of the possibilities of a sound-image made
up of irreducible phonic substance beyond linguistic or musicological
analysis.