A look at the art movements of the 20th century lists everything from Art Deco, Cubism and Dada to Surrealism, Op Art and Pop Art, but it often skips over the one movement that embodied the youth culture of the mid-century – the psychedelic images of the 1960s and 1970s. Perhaps no one influenced that period more than John Van Hamersveld, the southern California surfer-cum-designer whose “Endless Summer” movie poster became emblematic of the sun-drenched surfer culture. Van Hamersveld, who recalls being paid $150 for the poster, took a photograph of the film’s opening scene and converted it into sunset silhouettes by reducing each color to a single tone and giving each shape a single, hard edge. Van Hamersveld went on to design more than 300 record album covers for virtually every major rock star in the ‘60s. For aging baby boomers, Van Hamersveld illustrations are as much a symbol of the times as Beatles tunes, protest marches, acid-trips and love beads. Van Hamersveld’s iconic images are presented in his latest book, “John Van Hamersveld: 50 Years of Graphic Design,” released in June.