In the concept of Feng Shui, tables symbolize health and energy, so they should be 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 family area, 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 flowers and plants help the balance of yang and yin energy too, so have several good purposes. Another wonderful technique is to position photographs of family and friends on tables, since this is an immediate mood-enhancer when you enter in the living room.