The American company has always been a trendsetter in the field of smartphone construction. The brightest and most recent example is the cutout at the top of the screen, which was copied by a good half of the mobile device manufacturers.
However, not only Apple engineers can come up with interesting solutions. In early spring, the Chinese Huawei introduced the flagship P20 Pro, which, among other things, showed a gradient color.
Thinking, the American designers decided to “lick” this chip and after some time filed a patent for the surface treatment of the smartphone case. Creating special grooves with special machines on the case of gadgets, you can achieve a rainbow effect by smoothly turning the device in your hands.