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San Francisco psychedelia

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Joe Gomez,  Optical Occlusion , poster, 14 x 20 inches, Avalon Ballroom, 23, 24, 25 November 1967. Optical Occlusion One of the most striking and colourful of the many psychedelic posters which came out of San Francisco during the Summer of Love era between 1966-8 was Optical Occlusion by Joe Gomez. Announcing a series of concerts to be held at San Francisco's Avalon Ballroom on 23, 24 and 25 November 1967 featuring rock bands Big Brother and the Holding Company and Mt. Rushmore , the poster is distinguished by optical resonance induced in its upper section through the juxtaposition of bright (day-glo) pink and light blue inks within circular and rectangular blocks and lines. It is a variation on the then popular whirling, circular, black and white 'Time Tunnel' effect which attempted to artificially produce vertigo when moved or spun. In this instance the focal point is a small version of the Family Dog logo, rather than an inter-dimensional portal. Th