In modern homes, this can be unlikely to be possible due to space limitations, though traditionally, fireplaces were considered to be the ideal central element to some living room! But it's important to remember that the objective of your living room is 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 focal 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 might not otherwise enjoy. Mirrors make rooms look larger (and lighter) and very usefully, they can 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 any mirror is where it could possibly reflect a beautiful view, but once again, we must adapt this principle to modern cities and homes.