All right. Blue is easy to identify and is not occupied by other industries. Secondly, after numerous experiments, it is proved that white characters on a blue background are the clearest and the easiest to identify. From the psychological point of view, the main reason why white characters on blue background are more comfortable is the color psychology. Blue itself has the effect of calming the nerves, and the white font is neither too abrupt nor too low-key, which is gentle and calm, and is suitable for being the signboard of the health pavilion.