Wayne Thiebaud's art in the 1990s and beyond continued to explore themes and styles that solidified his position as a significant figure in American art. Although widely recognized for his vivid and tactile depictions of everyday objects and food items, which positioned him in close proximity to the Pop Art movement of the 1960s, Thiebaud's work in the later years of his career demonstrated a deepening exploration into landscapes and cityscapes, alongside a continued interest in still lifes. In the late 1990s, Thiebaud began a notable series focused on the landscapes of the Sacramento River Delta. These works are characterized by their vibrant hues and the artist's unique approach to perspective, which often eschewed traditional horizon lines in favor of flat, aerial views. Thiebaud's landscapes from this period exude a sense of tranquility and are marked by their rich textures and luminous colors, which appear even more brilliant through his signature technique of halation, where bright colors are enhanced by surrounding them with a halo of complementary hues​ (Acquavella Galleries)​​ (Phillips)​. Thiebaud's dedication to exploring the formal possibilities of painting remained evident in his approach to these landscapes. He often merged fiction and reality, drawing upon memories of landscapes seen in childhood, thereby infusing his works with a sense of the sublime while remaining grounded in the history of landscape painting, particularly that of the American West​ (Acquavella Galleries)​. Despite his achievements and the acclaim his work received, Thiebaud maintained a humble perspective on his art, often emphasizing his role as a traditional painter rather than aligning himself with any particular movement. His paintings from the 1990s and onwards, whether they depicted serene riverscapes, towering mountains, or the familiar items of American diners, continued to challenge and explore the boundaries of painting. Thiebaud's art remains a testament to his skillful craftsmanship and his unique ability to transform ordinary scenes and objects into subjects of profound beauty and significance​ (Acquavella Galleries)​.