In geomantic omen, it is not suitable to be a sub-door and leak out. Two doors are opened on one wall for mourning; One big and one small, the left is big and the right is small, which is not good for women at home, and the right is big and the left is small, which will be bad for the man, which will lead to loss of status, health or divorce.
We should block a door or make it invisible.