This item is about the commonality of the couple's appearance and the magnetic polarity assimilation, where mutual influences tend to assimilate. Commonality in the appearance of a couple means that they become increasingly similar in appearance due to frequent contact, convergence of habits and mutual influences. Similarly in physics, under changes in magnetic fields, I have observed changes in the motion of particles, where particles at different poles interact with each other, causing the two different poles to gradually assimilate. Thus the commonality of the different fields is discovered.