RMB Series consists of six oil mosaic paintings of Chinese currency Renminbi in different colors. RMB No. 1 is the first oil mosaic painting that Stone ever created in 2010, and since then, he continued to complete another five of them in five years. The brushstrokes on No. 1 differentiates the painting from the rest five. It’s apparent that as the technique becomes more sophisticated, Stone has developed a mature style in color-mixing, painting and shaping each cube on canvas.