In modern homes, this can be unlikely to be possible due to space limitations, though traditionally, fireplaces were considered to be the best central element to the living room! But it's important to remember that the objective of your living room is usually to be inviting to people, to get them to feel comfortable and relaxed, and stimulate good conversation. So, even without a central fireplace, making the fireplace some sort of focus will also work well. Mirrors are a wonderful tool to enhance Feng Shui in a living room. They bring light into darker areas and can reflect aspects of the bedroom that visitors might not exactly otherwise enjoy. Mirrors make rooms look larger (and lighter) and very usefully, they may reflect the door, so any seating that cannot face the entrance can still have the door visible through the use of mirrors. Once again, we need to adapt this principle to modern cities and homes, even though the best placement for a mirror is where it can reflect an attractive view.