In the practice of Feng Shui, tables symbolize health and energy, so they should be kept clean, tidy and as inviting as possible. Placing live plants or flowers on the central table is good for the health of people sitting in your living room, and the air is cleansed too. However, take care to avoid having plants with thorns, or very straight or spiky leaves. Plants with rounded leaves are better for energy flow. Live plants and flowers help the balance of yin and yang energy too, so have several good purposes. Another wonderful technique is to position photographs of family and friends on tables, because this is an immediate mood-enhancer when you enter into the living room.