Traditionally, fireplaces were considered to be the best central element to a living room, but in modern homes, this is unlikely to be possible on account of space limitations! But it's important to remember that the objective of your living room is to be inviting to people, to obtain 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 will reflect aspects of the space that visitors might not exactly otherwise enjoy. Mirrors make rooms look larger (and lighter) and very usefully, they can reflect the door, so any seating that cannot face the threshold can still have the door visible through the use of mirrors. Again, we need to adapt this principle to modern homes and cities, even though the best placement for a mirror is where it can reflect a lovely view.