The use of mirrors in geomantic omen has both positive and negative effects. The correct arrangement of mirrors can enhance or improve the feng shui situation, but if it is not properly arranged, it will do great harm to residents. One of the taboos of hanging a mirror in the kitchen is that the mirror can't shine on the stove fire. If you hang the mirror on the wall behind the stove and shine it on the food in the pot, it will do more harm. This is called "Tianmen fire", which will make the house suffer from fire or misfortune.
But hanging a mirror in the dining area to reflect the food on the table has the significance of doubling the wealth of the family.