Summarize the following:
You should place your mirrors so that they reflect nature. This is believed to bring positive chi inside your home. You can reflect the plants and trees in your front or backyard with mirrors to increase this chi. For example, if you have a large picture window in your living room that provides a view of the trees and plants in your front yard, place a mirror on the opposite wall to reflect that view. Using mirrors to reflect light from other areas of your home is believed to be good for your home's feng shui. Reflecting light in dark hallways is believed to be especially good for your home's chi. For example, you could hang a mirror near a window to reflect sunlight into a dark room or hallway. It is believed that reflecting doorways in a mirror sends good chi back out. Avoid reflecting doorways to keep your good chi in your home. There are other miscellaneous surfaces and items you should avoid reflecting in your mirrors. This includes your bed, any flames, another mirror, or sharp corners in your home or furniture.

Summary:
Amplify the outdoors with mirrors. Add light with mirrors. Avoid reflecting doors. Avoid reflecting certain surfaces and items.