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