colors in glaring contrast, elaborately ornate lettering, strongly symmetrical composition, collage elements, rubber-like distortions, and bizarre iconography are all hallmarks of the San Francisco psychedelic poster art style. The style flourished from about 1966 to 1972. Their work was immediately influential to vinyl record album cover art, and indeed all of the aforementioned artists also created album covers. Although San Francisco remained the hub of psychedelic art into the early 1970s, the style also developed internationally: British artist Bridget Riley became famous for her Op art paintings of psychedelic patterns creating optical illusions. Mati Klarwein created psychedelic masterpieces for Miles Davis' Jazz-Rock fusion albums, and also for Carlos Santana's Latin rock. Pink Floyd worked extensively with London-based designers, Hipgnosis to create graphics to support the concepts in their albums. Willem de Ridder created cover art for Van Morrison. Los Angeles area artists such as John Van Hamersveld, Warren Dayton and Art Bevacqua and New York artists Peter Max and Milton Glaser all produced posters for concerts or social commentary (such as the anti-war movement) that were highly collected during this time. Life Magazine's cover and lead article for the September 1, 1967 issue at the height of the Summer of Love focused on the explosion of psychedelic art on posters and the artists as leaders in the hippie counterculture community. Psychedelic light-shows were a new art-form developed for rock concerts. Using oil and dye in an emulsion that was set between large convex lenses upon overhead projectors the lightshow artists created bubbling liquid visuals that pulsed in rhythm to the music. This was mixed with slideshows and film loops to create an improvisational motion picture art form to give visual representation to the improvisational jams of the rock bands and create a completely "trippy" atmosphere for the audience. The Brotherhood of Light were responsible for many of the light-shows in San Francisco psychedelic rock concerts. Out of the psychedelic counterculture also arose a new genre of comic books: underground comix. "Zap Comix" was among the original underground comics, and featured the work of Robert Crumb, S. Clay Wilson, Victor Moscoso, Rick Griffin, and Robert Williams among others. Underground Comix were ribald, intensely satirical, and seemed to pursue weirdness for the sake of weirdness. Gilbert Shelton created perhaps the most enduring of underground cartoon characters, "The Fabulous Furry Freak Brothers", whose drugged out exploits held a hilarious mirror up to the