Sanqi design refers to the traditional Chinese method of color matching, which emphasizes the harmony and balance of colors. The term 'color pictures' likely refers to visual representations or illustrations showcasing the application of these color principles. Sanqi design is often used in traditional Chinese art, architecture, and fashion, focusing on the combination of red, green, blue, and yellow. These colors are believed to represent the four cardinal directions and are fundamental in creating a sense of balance and auspiciousness.