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