world peace day, 21th september, colorful rainbow flyer template, poster with flowers and anti-war retro motif of hippies movement

1960s 1970s 21th 60s 70s aggressive anti art attack conflict crisis danger dangerous destroy disarmament extremism flower graffiti graphic grunge grungy hippies icon illustration movement pacifist peace peaceful poster protest radiating ray retro revolt september sign spray street symbol syria terror terrorist vector war world