What formal elements did Andy Warhol use?

Andy Warhol employed several formal elements in his artwork, including repetition, bold color palettes, and the use of commercial techniques such as silkscreen printing. His focus on mass production and consumer culture is evident in works like the Campbell's Soup Cans and portraits of celebrities, where he often created variations of the same image. Warhol's use of flat, graphic styles and a lack of depth or perspective also contributed to the iconic pop art aesthetic. Through these elements, he challenged traditional notions of art and originality.