In the past, people listened to music through tapes. The length of the tape is adjusted by the rotation of the pencil, and the tape cassette is also adjusted by the rotation of the pencil. But with the progress of the times, tapes have basically been replaced by MP3 and smart phones, and people in the future will never know the unique relationship between tapes and pencils. In order to let people in the future know this unique relationship, I projected the behavior symbol of the pencil turning tape into the process of using the pencil sharpener. When using a pencil sharpener, people can know the unique relationship between tape and pencil.