In modern homes, this is unlikely to be possible due to space limitations, though traditionally, fireplaces were considered to be the perfect central element to some living room! But it's important to remember that the aim of your living room is usually to be inviting to people, to have 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 also reflect aspects of the bedroom that visitors might not otherwise enjoy. Mirrors make rooms look larger (and lighter) and very usefully, they are able to reflect the door, so any seating that cannot face the door can still have the door visible through the use of mirrors. The best placement for the mirror is where it could reflect a beautiful view, but once again, we have to adapt this principle to modern cities and homes.