The whistle of the distant train makes people feel melancholy. Sitting on the rickety green train and looking out the window at the white windmill on the far mountain will make people feel mixed. The symbol of vision and the association of hearing make people's emotions more mixed. One afternoon, the author had nothing to do and opened the Bluetooth speaker at home. It was a small square box. Its advantages were portability and simplicity, but its disadvantages were monotonous appearance and lack of dynamics. So the author's thinking jumped from the past to the future, what did the people in the past do? What will the people in the future do? In the author's opinion, the old things are new things in the eyes of the new generation, because they have not seen it, they will be surprised and have such a design, and they are full of emotion. From vinyl records to streaming music, the small opening of the tape player is unique, with small metal turntable, large transparent windows, tape and speakers, silver and black, sound and light. This Bluetooth speaker came into being on this basis. It is a nostalgia for the past and a dialogue with the future, designed to give consumers more choice. It also has more possibilities. The sound box adopts a "inclined plane" design, which is different from flat and vertical sound boxes. This design mainly considers the placement scene and is suitable for placing it on a lower table or bedside table. The top of the sound box is a switch and a functional area, which can switch songs, pause, adjust volume, etc. The side is a recording function and speaker. Around the design concept of "tide ebb and flow, audio-visual circulation", "tide ebb and flow" is the rhythm light on the speaker, light and sound, ups and downs, symbolizing the passage of time. The "audio-visual flow" is the two discs in the large window design and the electronic screen at the bottom. When you press the switch, the disc will start to rotate, and the electronic screen will light up and the lyrics will scroll slowly. The past and the future will form a line at this moment.