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Why shouldn't there be direct light on the top of the sofa

Sometimes the light around the sofa is weak, and many people will place lighting on the top of the sofa, for example, the downlights hidden on the ceiling or the spotlights exposed to the outside, because they are too close to the sofa, they tend to shine directly from the top of the head. It is against Feng Shui, so it should be avoided as much as possible. And in terms of environmental design, the direct light on the sofa head tends to make you nervous, dizzy, and restless. If you change the light to the wall, it can be slightly relieved.