How to divide the size when making Feng Shui mirror?

The choice and placement of mirrors are very particular and must meet the requirements of feng shui decoration.

In the decoration geomantic omen, the mirror plays the role of "energy multiplication in the home", but the premise is that the owner must choose the appropriate shape and size of the mirror and set the position of the mirror. The size of the mirror should be able to see the whole head. A mirror that is too small is only suitable for carrying around and is not suitable for installation at home.