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Its origins may be traced to European social movements in the 19th and early 20th century such as Bohemians, with influence from Eastern religion and spirituality. It is directly influenced and inspired by the Beat Generation, and American involvement in the Vietnam War. From around 1967, its fundamental ethos — including harmony with nature, communal living, artistic experimentation particularly in music, sexual experimentation, and the widespread use of recreational drugs — spread around the world during the counterculture of the 1960s, which has become closely associated with the subculture.