Multiple exposer is an exposure in which the sensitivity to light is reduced and then increased at least once during the total exposure time.

The purpose of art therapy is much the same as in any other psychotherapeutic modality, to improve or maintain mental health and emotional well- being. But whereas some of the other expressive therapies utilize the performing arts for expressive purposes, art therapy generally utilizes drawing, painting, sculpture, photography, and other forms of visual art expression

Macro photography refers to close-up photography; the classical definition that the image projected on the film plane when held  close to the same size as the subject.

Holography is the science of producing holograms; it is an advanced form of photography that allows an images to be recorded in three dimensions.