Is it better to install Roman columns or square columns at the gate?

Analysis of Feng Shui Forum: The sky is round, the ground is square, and the gate is still grounded. There is no doubt that it is a pillar in the front hall of the gate. But it is better to use square columns at the gate. At present, the mainstream is the door factory to make square columns. Because it is taboo to install columns on the gate. Of course, personal opinions are for reference only.