Powder food depends on the internal or external bureau.

Fanshan looks at the outside bureau. Geomantic omen refers to the external pattern of buildings, including the height of buildings, the height of trees, the direction of roads, the coming and going of water, the position of hills and other conditions that affect the good or bad of buildings. Inner office refers to the internal structure of the house, including the influence of plane structure, furniture layout, decoration color and lamps on the building. The importance of the external bureau of geomantic omen is slightly more than that of the internal bureau.