Red brick is the place of home, which means that the traffic at home is good, and gray brick is the place of guarding the city, which means that there is nothing wrong with sticking to it.
The practical application should be divided into five elements: whether to live at home and whether the owner is engaged in occupation. These two colors of bricks are universal. If you want to match it, it is to match the tiles, marble and other things on the outer wall.