Some people may wonder, if we should always pay attention to the changes of some things in our lives, will we become too sensitive or even a little neurotic? According to the author's experience, in fact, we don't need to be careful all the time in life. We only need to pay attention to the phenomenon of "external response" when time and space change. Time means time. From the numerology point of view, the node of time change is before and after the handover of Universiade and fleeting time. If it is more detailed, it is around the handover of seasons, such as beginning of spring, Changsha, beginning of autumn and beginning of winter. Empty refers to the living space. From the perspective of geomantic omen, the nodes of spatial change include building new houses, moving houses, burying graves and moving graves. Is there any difference in the "external reaction" displayed when time and space change? The biggest difference is that the effect of space lasts longer and affects more people. For example, when a family has a happy event on the day of building a new house, such as looking for money or having a dog come to the door, "external response" is shown as a good omen, indicating that the homestead has good feng shui and a beautiful life, which indicates that the process of building a house will be quite smooth, and the family business will flourish in the future, and some will continue to prosper for decades, and most or even all family members will have better luck. For example, when building a wall, firecrackers will be set off according to general folk customs. The firecrackers stopped ringing in the middle of burning. Obviously, "external response" is unlucky, which indicates that there will be more obstacles and twists and turns in the process of building houses. After moving in, some family members can hardly say that their careers are smooth and even have injuries. Another example is a family burying or moving a grave. If the whole process is buried smoothly with the help of distinguished people, the weather is fine when buried, or it is raining in Mao Mao, these "external reactions" all bode well for the future family prosperity, career luck, or at least safety. If there is a land dispute in the process of site selection or burial, and the weather coincides with lightning or rainstorm, these "external reactions" are unlucky, especially lightning, because lightning belongs to the most positive thing and the grave belongs to yin, indicating that the yin and yang of this cemetery are too heavy and attract each other.