What is the shape of the figure that is wide in front of the homestead and narrow in the back?

No matter what the direction of the mountain is, the house on the base of the house is behind the mountain and the direction of the door is in front. From the point of view of architectural geomantic omen, the foundation of a house with a wide front and a narrow back is unlucky. Golden Lock Guan Yu goes: It goes without saying that the front is wide and the back is narrow, and it is certain that the main family is short of selling the whole field; Children and grandchildren fled to other places because of their big mouths and fierce fists. As shown in the figure: