Hundreds of pins express graphics like pixels, so you can touch photos or graphs. In addition, the action is fast, so you can touch the iPhone screen in real time. A voice-over function that reads letters has been used to express graphs with high and low pitches, but there are limitations. I think it can be a useful experience not only for those who have difficulty seeing physically, but also for situations where seeing with the eyes is uncomfortable. As time goes by, I think it will evolve from a visual interface to a complex sensory interface.