HALLUCINATION

Definition of Hallucination by Wikipedia.org

A hallucination, in the broadest sense, is a perception in the absence of a stimulus. In a stricter sense, hallucinations are defined as perceptions in a conscious and awake state in the absence of external stimuli which have qualities of real perception, in that they are vivid, substantial, and located in external objective space. The latter definition distinguishes hallucinations from the related phenomena of dreaming, which does not involve consciousness; illusion, which involves distorted or misinterpreted real perception; imagery, which does not mimic real perception and is under voluntary control; and pseudohallucination, which does not mimic real perception, but is not under voluntary control. Hallucinations also differ from "delusional perceptions", in which a correctly sensed and interpreted genuine perception is given some additional (and typically bizarre) significance.
Hallucinations can occur in any sensory modality — visual, auditory, olfactory, gustatory, tactile, proprioceptive, equilibrioceptive, nociceptive, and thermoceptive.
A mild form of hallucination is known as a disturbance, and can occur in any of the senses above. These may be things like seeing movement in peripheral vision, or hearing faint noises and voices.
Hypnagogic hallucinations and hypnopompic hallucinations are considered normal phenomena. Hypnagogic hallucinations can occur as one is falling asleep and hypnopompic hallucinations occur when one is waking up.
Hallucinations can also be associated with drug or alcohol use (particularly deliriants), sleep deprivation, psychosis, neurological disorders, and delirium tremens.

Stages of a hallucination

Emergence of surprising or warded-off memory or fantasy images
Frequent reality checks
Last vestige of insight as hallucinations become "real"
Fantasy and distortion elaborated upon and confused with actual perception
Internal-external boundaries destroyed and possible panentheistic experience

http://en.wikipedia.org/wiki/Hallucination

Through the Toilet Bowl

Renton searching for his 'final hit'

Trainspotting 1996
Directed by Danny Boyle

SPACE OF PURE IMAGINATION

Michelangelo Pistoletto
From the Minus Objects series of 1965-66: A Cubic Meter Of Infinity
Galleria Continua, Beijing 2008

'HAVE YOU EVER ANALYSED THINGS TO THE DEGREE THAT YOU DON'T KNOW WHAT'S REAL AND WHAT YOU HAVE CREATED IN YOUR HEAD'

(Sienna Miller as Edie Sedgwick in the film Factory Girl)

'No great artist ever sees things as they really are, if he did he would cease to be an artist'

Oscar Wilde

KURT COBAIN'S THOUGHTS

From Kurt Cobain's Journals there is a really thought provoking description of daydreaming and things becoming strictly observatory.

Party Monster
2003
Directors: Fenton Bailey, Randy Barbato

In the film there is an interesting description about how being on heroin could make even something as mundane as a table intriguing for days. Observing this one subject in a thousand different ways.