This detail may also be there to take some material thickness away from the thick center stalk below the button to reduce or maybe even build in any sinking that might occur from the injection molding process. The black directional pad has been given some interesting surface details, some matte areas for grip and a half sphere indent to help the thumb locate the center. Their simple shapes have been nicely color coded by their function creating a restrained color palette of magenta, black, and grey.
The buttons on the Game Boy add a ton to it's iconic design.
