The discovery of LSD and its subsequent popularity as an agent that produces altered states of consciousness was at the core of the Psychedelic Art movement; however, other drugs were also used as a means of inducing certain types of artistic expressions. Various poster artists of San Francisco were responsible for launching the Psychedelic Art movement during the 1960s such as Rick Griffon, Wes Wilson, and Victor Moscoso. The psychedelic style peaked between 1966 and 1972. Many works, especially evident in concert and event posters, depicted a strong color palette—usually of contrasting colors—along with ornate lettering, and kaleidoscopic swirls. The art of this period also reflected Art Nouveau and Victorian influences.