It's called design tremolo because it's a quick idea, a crude design, a fast-food expression. This is a barrier-free concept of the watch design, I deconstructed the hands of the watch, with dents and convex up to express the time, I do not know if anyone has such a design.
The material of wood was chosen because the wood grain has a special touch and the traces of annual rings have a sense of time. This can not only help the blind to use, simple function and shape, but also a trendy item, allowing ordinary people to determine the approximate time by hand groping at night when they do not want to open their eyes early in the morning.