In previous courses, we have found that when students prepare drawing reference materials, they often do not know whether the size of the picture they want is suitable, and they repeatedly print or photocopy to enlarge; given that mathematics courses are all about enlarging and reducing simple figures. , so we hope to allow students to experience the concept of "enlargement" in mathematics during the creative process. Through the production of hand-painted line drawings, students can experience the process of manually enlarging patterns, so that the knowledge that is unfamiliar in textbooks can be , can be linked during the creative process.