Why shouldn't arch design be used for gates?

In order to pursue the unique appearance, some commercial buildings design the gate as an arch, which is actually a very bad pattern from the perspective of geomantic omen. Because according to the traditional concept, arc arches will only be used in the design of cemeteries, and it is of course a no-no for the gates of commercial space to adopt this pattern. In addition, like residential requirements, the design of commercial space also requires keeping static as much as possible. The circular arch is often designed as a curve with a certain radian, and the five elements of the curve belong to water, which means that it has dynamic characteristics and violates the basic requirements of spatial geomantic omen, so it should be avoided as much as possible.