From the perspective of geomantic omen, the shape of every object belongs to five elements: round metal, square soil, long wood, triangle fire and wave water.
The arch is semicircular, so the five elements are also gold.
Some feng shui masters think that rings are murderous. Therefore, it is not a big problem to use memorial archways in temples or Buddhist temples, because nine out of ten people living in them are "lonely" people, and their six relatives are not afraid of this kind of killing. Ordinary people, on the other hand, have unlucky arches, and their families are prone to trouble, but their health is poor.
However, as far as "time" is concerned, the circle is the shape of luck. 1984-2003 The Seventh Bureau of Geomantic omen in Kong Xuan, with the hexagrams exchanged, the five elements belong to gold and the shape is round. This school of feng shui is the most important, whether it is auspicious or not, it will decline if it is lost. Because it is round, it is also auspicious to use it in seven games.
But remember, since 2004, it has been the eighth National Games, and the circle is gone. Unless the interior decoration can match the house, it will be considered a disaster.