In modern homes, this can be unlikely to be possible due to space limitations, though traditionally, fireplaces were considered to be the optimal central element to some living room! But it's important to remember that the purpose of your living room is being inviting to people, for getting them to feel comfortable and relaxed, and stimulate good conversation. So even without a central fireplace, making the fireplace some sort of center of attention 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 space that visitors might not exactly 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 entranceway can still have the door visible through the use of mirrors. The best placement for any mirror is where it could reflect a beautiful view, but once again, we must adapt this principle to modern homes and cities.