Incorporate "color" among the visual art elements (art elements) in art courses. The feeling of object color: Since human beings' reaction to color is closely related to their psychological experience, physiological feelings and even customs and habits, among all visual art elements, color is the one that can most trigger the emotional effect of the viewer. The course is designed as a painted reusable bag. I hope to use mathematics to explore the three primary hues of color and the proportions of various colors, the three primary hues and the percentages of various colors; music to focus on the level of music and the interpretation of music; and art to start with what color is and painted environmental bags.