As far back as 1500 B.C. humans have always held the view internally that our normal vision of the world is a hallucination dream, a deep imagination or both art and illusion. If this is true consequently, life suppose not to be taken seriously. It is a drama to be enjoyed, something to fantasize and a play to watch. Life does not really matter, for one day (probably when death beckons) the illusion will be dissolved, and thereafter everyone will awaken to discover that he/she is what actually existed and nothing more These experiences may occur ones or repeatedly and make up a permanent change of consciousness. It may also descend upon those who had never heard of them, likewise those who have spent years trying to form them as habit through discipline.
However, since those experiences cannot be induced, a suitable atmosphere may be created by intense concentration, by fasting, by sensory deprivation, by hyper-oxygenation, by prolonged emotional stress, by profound relaxation, or by the use of certain drugs. This is the reason many world religion has been birth-Hinduism, Buddhism, Judaism, Islam to name a few. They try to explain "the way things are" but contradicts common sense so violently and are accompanied with such powerful sense of authenticity and reality, making men to wonder more if they are divine or delusions.
The general public now believes that experiences of this type are available, with relative ease, through the use of psychedelic medicines, LSD-25, mescaline, psilocybin, hashish, and marijuana, to name only the known few. This gave rise to a movement in the early 60's called Psychedelic movement. These groups use psychedelic medicines, and a style of psychedelic artwork (including clothing) and psychedelic music derived from the experience of altered consciousness to evoke and convey to a viewer or listener their experience while using such medicines. They use highly distorted and surreal visuals, sound effects and reverberation, bright colors and full spectrum and animation (including cartoons) to express the way they feel.
Curvilinear shapes, clashing colors, and loud textures, are seems to be used by artists who want to create the visual of "tripping out" on their paper.
Appropriating simple objects and clashing colors are part of the pop art movement, which are seen in a lot of psychedelic art. The art sought to express the sense of medicines-induced dreamy reverie, which was also expressed through music of the time. Common artists that started this included Andy Warhol, Roy Lichtenstein, Wes Wilson, Rick Griffin and Victor Moscoso.