Nothing brightens up a room like a mirror. It distributes light and creates the illusion of more space. In Feng Shui, it is recommended to hang a mirror by your entrance door to expend your pool of life opportunities. It also raises your confidence factor... you can check yourself out in the morning before heading out to the world.
A mirror is also great to widen a narrow corridor to help the Chi energy circulate better. It even adds visual square footage in any room.
One way to take even greater advantage of the reflective benefits of mirrors is to incorporate mirrored furniture. Nothing looks cleaner than a perfect mirrored panel, and nothing sparkles day and night with such pristine glamour.