playful naive abstract yellow background. posters with geometric s in trendy retro brutalist style. flier with oval and

abstract playful background basic arch brutalism 90s shape figure yellow retro groovy graphic modern simple vector art illustration curve circle funny star form naive vintage flat oval minimal collection funky trendy swiss brutalist contemporary decoration doodle collage bauhaus children colorful geometry swirl wave line bright set poster psychedelic isolated posters geometric shapes style flier design aesthetic brutal