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