A smart feng shui use of mirrors will make the space bigger and brighter, attract the desired energy of abundance and calm, correct various design mistakes, as well as attract more vital energy into your home. Of course, it is very important to know what is it exactly that you are doing with mirrors, because a random placement of mirrors, no matter how beautiful or visually appealing, can often create bad feng shui energy. A mirror in the main entrance is usually good feng shui for several reasons.
You can also add a touch of luxury to your home (if the mirror frame is glamorous or unique). Your hallway can benefit from mirrors just as the main entry can, and that applies to both big and small hallways. The one placement to avoid at all costs is placing a mirror facing the staircase. Why? Staircases are considered challenging in feng shui, no matter which bagua area of the house they are located in. Staircases are considered challenging in feng shui, no matter which area of the house.
Placing a mirror reflecting the staircase only doubles the unsettling and ungrounding energy of the staircase. While a big mirror in any space looks appealing because it adds beauty, light and a sense of spaciousness (especially if the mirror is beautifully framed), placing mirrors so that they reflect each other is considered challenging feng shui. This specific placement of mirrors creates a constant bouncing of energy similar to a very active and chaotic movement, which is definitely not good feng shui in homes.