In the technique 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. Take care to avoid having plants with thorns. Alternatively, very straight or spiky leaves. Plants with rounded leaves are better for energy flow. Live plants and flowers help the balance of yang and yin energy too, so have several good purposes. Another wonderful technique is to place photographs of relatives on tables, since this is an immediate mood-enhancer when you go into the living room.