The Mi 9 combines a beautiful appearance, extremely comfortable feel and very strong performance. The greatest design challenge was to achieve a balance between hardware performance and beauty. The back cover has a lightweight curved design with no flat surface to be found. We can see an "s"-shaped reflection on the cover of the battery at some angles, which is the result not of texture and color, but of a play of light and shadow on the surface. The holographic color scheme causes the Mi 9 to shimmer depending on lighting conditions and the angle at which it is held.