Refers to the art and cultural movement of the mid- to late 1960s that was international in scope, but flourished mainly on the American West Coast. The movement advocated the exploration of the subconscious mind through drugs, sensory deprivation, and a total immersion of the senses through music and light shows. In the visual arts, the style is characterized by obsessively detailed images, ambiguous representations of space, and acidic colors.
Source: Art & Architecture Thesaurus
http://vocab.getty.edu/page/aat/300112743
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