In the 2000s, Jeff Koons continued to expand his exploration of cultural symbols and the commodification of desire through his art. This decade saw him working on some of his most iconic series and installations, which were characterized by their meticulous craftsmanship, monumental scale, and vibrant, reflective surfaces. One of the highlights of this period was the "Celebration" series, which included the famous "Balloon Dog" sculptures. Made from high-chromium stainless steel with transparent color coating, these sculptures are among Koons's most recognizable works. They exemplify his fascination with childhood innocence and the transformation of everyday objects into high art​ (Art21)​. Koons also created "Split-Rocker," a monumental sculpture presented at the "Jeff Koons Versailles" exhibition in 2008. This work combined two halves of different toy rockers—a horse and a dinosaur—covered in live flowering plants. The sculpture, standing at over 37 feet high, reflected Koons's interest in dichotomy and the coexistence of opposites, as well as his ongoing engagement with engineering and horticulture​ (Art21)​. Another significant work from this period is "Play-Doh," an oil on canvas piece that took over two decades to complete. This painting is part of Koons's efforts to materialize the ephemeral qualities of childhood playthings and moments into something permanent and monumental​ (Art21)​. Throughout the 2000s, Koons's work continued to challenge the boundaries between high and low culture, employing a wide range of materials and techniques to create pieces that resonate with a broad audience. His artwork from this period was widely exhibited, including a notable retrospective at the Whitney Museum of American Art, which highlighted the breadth of his contributions to contemporary art​ (Whitney Museum of American Art)​. Koons's art in the 2000s, marked by its visual opulence and thematic depth, played a crucial role in the ongoing conversations about the nature of art, celebrity, and the commercialization of the aesthetic experience.