Peter Frank writing for artcommotion.com, briefly explains the Fluxus movement of which Yoko is undoubtedly the most famous practitioner.

"
The Fluxus movement emerged in New York around 1960, then it took root in Europe, and eventually in its way to Japan...

Fluxus objects and performances are characterized by minimalist but often expansive gestures based in scientific, philosophical, sociological, or other extra-artistic ideas and leavened with burlesque.

Yoko Ono is the best-known individual associated with Fluxus, but many artists have associated themselves with Fluxus since its emergence. In the '60s, when the Fluxus movement was most active, artists all over the globe worked in concert with a spontaneously generated but carefully maintained Fluxus network. Since then, Fluxus has endured not so much as a movement but as a sensibility--a way of fusing certain radical social attitudes with ever--evolving aesthetic practices. "



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